CN203537260U - Seven-level single-phase inverter circuit - Google Patents
Seven-level single-phase inverter circuit Download PDFInfo
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- CN203537260U CN203537260U CN201320640948.4U CN201320640948U CN203537260U CN 203537260 U CN203537260 U CN 203537260U CN 201320640948 U CN201320640948 U CN 201320640948U CN 203537260 U CN203537260 U CN 203537260U
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Abstract
The utility model proposes a seven-level single-phase inverter circuit which comprises an alternating current access port, a reactor, a power switching circuit and a direct-current power supply V1, a direct-current power supply V2 and a direct-current power supply V3, wherein the alternating current access port is provided with an a end and a b end; the power switching circuit includes right power switches; and one end of the reactor is connected with the a end of the alternating current access port, and the other end of the reactor and the b end of the alternating current access port are respectively electrically connected with the power switching circuit. The seven-level single-phase inverter circuit can output seven different level combinations, and has the advantages of few power switches, simple control and stable operation.
Description
Technical field
The utility model relates to a kind of inverter, refers in particular to a kind of seven level single-phase inverter circuit.
Background technology
Electric energy is important energy source indispensable in modern society, has application very widely in different fields, makes the bearing pressure of modern power network very big, and shortage of electric power state is increasingly serious.Along with the development of modern industrial technology, in electric power system, nonlinear-load rolls up, various non-linear and time variation electronic installation application as large-scale in inverter, rectifier and various Switching Power Supplies etc., and the negative effect causing is also day by day obvious.
In the past few decades, scholars have carried out a large amount of research and exploration, proposed various raising delivery of electrical energy efficiency and reduced the method for power electronic equipment to electric network influencing, multilevel converter is exactly a kind of representative and comparatively desirable solution wherein.The concept of multi-level converter is proposed in IEEE commercial Application in 1980 annual meeting by people such as Japanese scholars A.Nabae the earliest, this circuit is divided into three level with the electric capacity of two series connection by DC bus-bar voltage, each brachium pontis is connected with four power switchs, in parallel with pair of series clamp diode and inner side power switch pipe, centre cap is connected with the 3rd level, form so-called neutral-point-clamped (NPC-Neutral Point Clamped) converter, master power switch pipe only bears half of DC bus-bar voltage while turn-offing, so be particularly suitable for high-power application scenario.Nineteen eighty-three, the scholars such as Bhagwat on this basis, are generalized to many level arbitrarily by tri-level circuit, and alignment clamp circuit and unified structure thereof have been done further research.
Present stage, many level became the focus of high-voltage high-power converter research, had formed various topological structures: effectively improve output voltage waveforms, reduced wave distortion in output voltage; Can realize high-power output with the lower power device of withstand voltage; With lower switching frequency, obtain the output voltage waveforms of upper frequency, thereby efficiency is higher; Dv/dt stress greatly reduces, and improves the EMI characteristic of device.Yet the topological structure of existing multi-electrical level inverter is all deposited a fairly large number of shortcoming of power switch, this,, with regard to having brought difficulty to the design of controller, has limited their application in practice.The utility model is exactly for this shortcoming, by reducing power switch quantity, improves the stability of operation, the requirement of also having demoted to controller simultaneously.
Utility model content
In order to solve, existing multi-electrical level inverter topological structure is complicated, a fairly large number of problem of power switch, the utility model proposes a kind of seven level single-phase inverter circuit, can export seven different level combinations, have advantages of that power switch is few, it is simple to control, stable.
The technical scheme that the utility model adopts is: a kind of seven level single-phase inverter circuit, comprise interchange access interface, reactor, power switch circuit and DC power supply V1, DC power supply V2 and DC power supply V3, described interchange access interface 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 and power switch Q8, one end of described reactor connects a end that exchanges port, the emitter of the other end of reactor and power switch Q1, the collector electrode of power switch Q4 is electrically connected to, and exchanges the b end of port and the emitter of power switch Q2, the collector electrode of power switch Q3 is electrically connected to, the collector electrode of power switch Q1, the collector electrode of power switch Q2, the emitter of power switch Q5, the emitter of power switch Q6 is electrically connected to, the emitter of power switch Q3, the emitter of power switch Q4, the emitter of power switch Q7, the collector electrode of power switch Q8 is electrically connected to, and the positive pole of DC power supply V1 is electrically connected to the collector electrode of power switch Q5, the negative pole of DC power supply V1, the positive pole of DC power supply V2 is electrically connected to the collector electrode of power switch Q6 respectively, the negative pole of DC power supply V2, the positive pole of DC power supply V3 is electrically connected to the collector electrode of power switch Q7 respectively, and the negative pole of DC power supply V3 is electrically connected to the emitter of power switch Q8.
The utility model can be exported seven 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 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 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 is identical.The circuit of design has symmetry like this.
As preferably, 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 access interface, and the two ends of described filter capacitor connect respectively the positive pole and the b end that exchanges access interface 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 beneficial effects of the utility model are: have power switch quantity few, simple in structure, reduced the dependence of inverter to controller, can improve the stability of whole system, in actual application, the switch stress of each switch is less, can reduce the energy consumption of inverter itself, effectively reduce the volume of radiator, increase inverter overall efficiency.
Accompanying drawing explanation
Fig. 1 is a kind of circuit diagram of the present utility model;
Fig. 2 is another kind of circuit diagram of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
Embodiment 1
As shown in Figure 1, a kind of seven level single-phase inverter circuit, comprise and exchange access interface J1, reactor L1, power switch circuit and DC power supply V1, DC power supply V2 and DC power supply V3, exchange access interface J1 and be 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 and power switch Q8, one end of reactor L1 connects a end that exchanges port J1, the emitter of the other end of reactor L1 and power switch Q1, the collector electrode of power switch Q4 is electrically connected to, and exchanges the b end of port and the emitter of power switch Q2, the collector electrode of power switch Q3 is electrically connected to, the collector electrode of power switch Q1, the collector electrode of power switch Q2, the emitter of power switch Q5, the emitter of power switch Q6 is electrically connected to, the emitter of power switch Q3, the emitter of power switch Q4, the emitter of power switch Q7, the collector electrode of power switch Q8 is electrically connected to, and the positive pole of DC power supply V1 is electrically connected to the collector electrode of power switch Q5, the negative pole of DC power supply V1, the positive pole of DC power supply V2 is electrically connected to the collector electrode of power switch Q6 respectively, the negative pole of DC power supply V2, the positive pole of DC power supply V3 is electrically connected to the collector electrode of power switch Q7 respectively, and the negative pole of DC power supply V3 is electrically connected to the emitter of power switch Q8.
Wherein, reactor L1 is smoothing reactor, and for flat ripple effect, choosing of smoothing reactor can be chosen according to direct voltage and AC voltage.The magnitude of voltage of DC power supply V1, DC power supply V2, DC power supply V3 is identical and be vdc, is responsible for balance direct voltage, and AC energy is provided.
Power switch Q1, power switch Q2, power switch Q3, power switch Q4, power switch Q5, power switch Q6, power switch Q7, power switch Q8 are 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, power switch Q6, power switch Q7, power switch Q8 are 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 utility model can produce seven different level at AC incoming end and exports by controlling the combination of different power switch: 0, vdc, 2vdc, 3vdc ,-vdc ,-2vdc and-3vdc seven different level outputs altogether.
The utility model utilizes different power switch combinations and forms 10 kinds of mode of operations, and can have seven kinds of different direct voltage outputs in these 10 kinds of mode of operations: power switch Q1, power switch Q5, power switch Q8 and power switch Q3 conducting, when other power switchs disconnect, DC power supply V1, DC power supply V2, DC power supply V3 be output current simultaneously, and ac output voltage is now 3vdc; Power switch Q1, power switch Q5, power switch Q3 and power switch Q7 conducting, when other power switchs disconnect, DC power supply V1, DC power supply V2 be output current simultaneously, and DC power supply V3 is in vacant state, and ac output voltage is now 2vdc; Power switch Q1, power switch Q6, power switch Q8 and power switch Q3 conducting, when other power switchs disconnect, DC power supply V2, DC power supply V3 be output current simultaneously, and DC power supply V1 is in vacant state, and ac output voltage is now 2vdc; Power switch Q1, power switch Q6, power switch Q7 and power switch Q3 conducting, when other power switchs disconnect, DC power supply V1 output current, DC power supply V2, DC power supply V3 are in vacant state, and ac output voltage is now vdc; Power switch Q4, power switch Q7, power switch Q6 and power switch Q2 conducting, when other power switchs disconnect, DC power supply V1 output current, for oppositely, DC power supply V2, DC power supply V3 are in vacant state, and ac output voltage is now-vdc; Power switch Q4, power switch Q7, power switch Q5 and power switch Q2 conducting, when other power switchs disconnect, DC power supply V1, DC power supply V2 be output current simultaneously, for oppositely, DC power supply V3 is in vacant state, and ac output voltage is now-2vdc; Power switch Q4, power switch Q8, power switch Q6 and power switch Q2 conducting, when other power switchs disconnect, DC power supply V2, DC power supply V3 be output current simultaneously, for oppositely, DC power supply V1 is in vacant state, and ac output voltage is now-2vdc; Power switch Q4, power switch Q8, power switch Q5 and power switch Q2 conducting, when other power switchs disconnect, DC power supply V1, DC power supply V2, DC power supply V3 be output current simultaneously, and for oppositely, ac output voltage is now-3vdc; Power switch Q1, power switch Q2 conducting, when other power switchs disconnect, DC power supply V1, DC power supply V2, DC power supply V3 are all in vacant state, and ac output voltage is now 0; Power switch Q4, power switch Q3 conducting, when other power switchs disconnect, DC power supply V1, DC power supply V2, DC power supply V3 are all in vacant state, and ac output voltage is now 0.
In sum, inverter circuit one of the present utility model has ten kinds of mode of operations, in these ten kinds of mode of operations, mode of operation output voltage is a 3vdc, and two kinds of mode of operation output voltages are 2vdc, and a kind of mode of operation output voltage is vdc, a kind of mode of operation output voltage is-vdc, two kinds of mode of operation output voltages are-2vdc that a kind of mode of operation output voltage is-3vdc that two kinds of mode of operation 10 output voltages are 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 access interface J1, the two ends of filter capacitor C1 connect respectively the positive pole and the b end that exchanges access interface 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 are MOSFET.Identical in other and embodiment 1.
Above embodiment is only explanation technological thought of the present utility model; can not limit protection range of the present utility model with this; every technological thought according to the utility model proposes, any change of doing on technical scheme basis, within all falling into protection range of the present utility model.
Claims (6)
1. seven level single-phase inverter circuit, is characterized in that: comprise interchange access interface, reactor, power switch circuit and DC power supply V1, DC power supply V2 and DC power supply V3, described interchange access interface 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 and power switch Q8, one end of described reactor connects a end that exchanges port, the emitter of the other end of reactor and power switch Q1, the collector electrode of power switch Q4 is electrically connected to, and exchanges the b end of port and the emitter of power switch Q2, the collector electrode of power switch Q3 is electrically connected to, the collector electrode of power switch Q1, the collector electrode of power switch Q2, the emitter of power switch Q5, the emitter of power switch Q6 is electrically connected to, the emitter of power switch Q3, the emitter of power switch Q4, the emitter of power switch Q7, the collector electrode of power switch Q8 is electrically connected to, and the positive pole of DC power supply V1 is electrically connected to the collector electrode of power switch Q5, the negative pole of DC power supply V1, the positive pole of DC power supply V2 is electrically connected to the collector electrode of power switch Q6 respectively, the negative pole of DC power supply V2, the positive pole of DC power supply V3 is electrically connected to the collector electrode of power switch Q7 respectively, and the negative pole of DC power supply V3 is electrically connected to the emitter of power switch Q8.
2. seven level single-phase inverter circuit according to claim 1, is characterized in that: described reactor is smoothing reactor.
3. seven level single-phase inverter circuit 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 are IGBT.
4. seven level single-phase inverter circuit 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 are MOSFET.
5. seven level single-phase inverter circuit 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 is identical.
6. according to seven level single-phase inverter circuit described in claim 1 to 5 any one, it is characterized in that: 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 access interface, and the two ends of described filter capacitor connect respectively the positive pole and the b end that exchanges access interface of diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320640948.4U CN203537260U (en) | 2013-10-17 | 2013-10-17 | Seven-level single-phase inverter circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320640948.4U CN203537260U (en) | 2013-10-17 | 2013-10-17 | Seven-level single-phase inverter circuit |
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| CN203537260U true CN203537260U (en) | 2014-04-09 |
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| CN201320640948.4U Expired - Lifetime CN203537260U (en) | 2013-10-17 | 2013-10-17 | Seven-level single-phase inverter circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633867A (en) * | 2013-10-17 | 2014-03-12 | 宁波绿凯节能科技有限公司 | Seven-level single-phase inverter circuit |
| EP3493391A1 (en) * | 2017-11-30 | 2019-06-05 | Siemens Aktiengesellschaft | Single phase seven level converter |
-
2013
- 2013-10-17 CN CN201320640948.4U patent/CN203537260U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633867A (en) * | 2013-10-17 | 2014-03-12 | 宁波绿凯节能科技有限公司 | Seven-level single-phase inverter circuit |
| EP3493391A1 (en) * | 2017-11-30 | 2019-06-05 | Siemens Aktiengesellschaft | Single phase seven level converter |
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Granted publication date: 20140409 |