CN114583991A - Gain-adjustable single-phase DCAC converter, control method and three-phase DCAC converter - Google Patents
Gain-adjustable single-phase DCAC converter, control method and three-phase DCAC converter Download PDFInfo
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- CN114583991A CN114583991A CN202210491267.XA CN202210491267A CN114583991A CN 114583991 A CN114583991 A CN 114583991A CN 202210491267 A CN202210491267 A CN 202210491267A CN 114583991 A CN114583991 A CN 114583991A
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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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
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Abstract
The invention provides a gain-adjustable single-phase DCAC converter, which comprises a direct-current power supply, a first inductor, a second inductor, a first switching tube, a bidirectional switch, a third switching tube, a first capacitor, a second capacitor, a load, a first diode and a second diode, wherein the first inductor is connected with the first switching tube; the positive electrode of the direct current power supply is connected with the first end of the first switching tube; when the gain to be achieved is less than 0 or the gain to be achieved is greater than 1, the single-phase DCAC converter works in a first working mode, namely the discontinuous inverter works in a voltage reduction mode, and when the gain to be achieved is less than 0 and less than 1, the discontinuous inverter cannot meet working conditions, the single-phase DCAC converter is switched to a second working mode, and the Buck circuit continues to work, so that high gain is achieved. The invention also provides a control method of the gain-adjustable single-phase DCAC converter and a three-phase inverter.
Description
Technical Field
The invention relates to the technical field of inverters, in particular to a gain-adjustable single-phase DCAC converter, a control method and a three-phase DCAC converter.
Background
The inverters are divided into voltage source inverters and current source inverters, and most of the conventional voltage source inverters are voltage reduction circuits, that is, the output ac voltage is lower than the input dc voltage. Therefore, at present, many applications are that a first stage Boost circuit (such as a Boost circuit) is added before an inverter circuit, so that the inverter becomes a two-stage structure, the size is increased, and the system stability is reduced, so that it is important to research a single-stage high-gain inverter, and therefore, researchers propose a Z-source inverter, which is an impedance network formed by two inductors and two capacitors, and can realize a Boost function, so that extensive research is performed.
The current leakage problem of a non-isolated inverter system is mainly solved by two ideas, one idea is that through topology and modulation, scholars at home and abroad propose a plurality of improved topological structures which can be mainly divided into a single-inductor structure and a symmetrical inductor structure, wherein the symmetrical inductor structure can be divided into a direct current side bypass structure and an alternating current side bypass structure, and the more typical structures comprise H5, H6, improved H6, mixed H6, HERIC and other topological structures. Although these improved topologies and controls reduce leakage current to some extent, they are also only suppressive and do not address the leakage current problem at its root. The other idea is to use a topology structure with input and output being in common ground, the generation of the leakage current is due to the parasitic capacitance between the photovoltaic array and the ground, and meanwhile, because the isolation effect of the transformer is not provided, the current passes through the parasitic capacitance to form a loop in the circuit, so that the leakage current is generated, and if the topology with input and output being in common ground is constructed, the parasitic capacitance can be bypassed, so that the leakage current problem is fundamentally solved.
Compared with the traditional Z source inverter, the existing inverter is named as a Semi-Z source inverter, as shown in figure 1, and the other is named as a Semi-quasi-Z source inverter, as shown in figure 2, only two switching tubes are used, meanwhile, an impedance network of a Z source is reserved, but a through state of the Z source is not utilized, more, the common ground of input and output is realized, and the problem of leakage current is thoroughly solved, but the circuit has the great defect that the positive gain of the two proposed topologies can only reach 1 to the maximum, and the negative gain can reach infinity, so that the inverter can only achieve 1-time gain to the maximum.
Disclosure of Invention
The invention aims to provide a single-phase DCAC converter with adjustable gain, a control method and a three-phase DCAC converter, and aims to solve the problem that the existing inverter can only achieve 1-time gain at most.
The invention provides a gain-adjustable single-phase DCAC converter, which comprises a direct-current power supply, a first inductor, a second inductor, a first switching tube, a bidirectional switch, a third switching tube, a first capacitor, a second capacitor, a load, a first diode and a second diode, wherein the first inductor is connected with the first switching tube; the positive electrode of the direct current power supply is connected with the first end of the first switching tube; the second end of the first switch tube is connected with the anode of the first diode, and the cathode of the first diode is respectively connected with the second end of the first capacitor, the cathode of the second diode and the first end of the second inductor; a first end of the first capacitor is connected with a second end of the first inductor and a first end of the bidirectional switch respectively, and a second end of the bidirectional switch is connected with a second end of the second inductor, a first end of the second capacitor and a first end of the load respectively; the anode of the second diode is connected with the second end of the third switching tube; the negative electrode of the direct current power supply, the first end of the first inductor, the first end of the third switching tube, the second end of the second capacitor and the second end of the load are all grounded.
When the gain to be achieved is less than 0 or the gain to be achieved is greater than 1, the single-phase DCAC converter works in a first working mode, namely the discontinuous inverter works in a voltage reduction mode, and when the gain to be achieved is less than 0 and less than 1, the discontinuous inverter cannot meet working conditions, the single-phase DCAC converter is switched to a second working mode, and the Buck circuit continues to work, so that high gain is achieved.
Further, the bidirectional switch includes a third diode and a second switch tube, a first end of the third diode is connected to the second end of the first inductor and the first end of the first capacitor, a second end of the third diode is connected to the first end of the second switch tube, and a second end of the second switch tube is connected to the second end of the second inductor, the first end of the second capacitor, and the first end of the load.
Further, the first switching tube, the second switching tube and the third switching tube each include any one of an IGBT, a MOSFET or a triode.
Further, the third diode and the second switching tube may be connected in series or in parallel.
Further, the gain-adjustable single-phase DCAC converter includes a first operating mode, in the first operating mode, the third switching tube remains off, and at this time, the first switching tube, the third diode and the second switching tube cooperate to perform buck inversion, where the third diode and the second switching tube are driven the same, and the first operating mode includes two operating states; in the first working state, the first switching tube is switched on, and the third diode and the second switching tube are switched off; and in the second working state, the first switch tube is switched off, and the third diode and the second switch tube are switched on.
Further, the gain-adjustable single-phase DCAC converter comprises a second operation mode, in the second operation mode, the third diode and the second switch tube are kept off, the first switch tube, the first diode, the second diode, the third switch tube and the second inductor form a Buck circuit, and the Buck circuit is configured by the first switch tube and the third switch tube working cooperatively to perform Buck, and the second operation mode comprises a first operation state and a second operation state; in the first working state, the first switching tube is switched on, and the third switching tube is switched off; and in the second working state, the first switching tube is switched off, and the third switching tube is switched on.
The invention also provides a control method of the gain-adjustable single-phase DCAC converter, which comprises the following steps: when the desired gain is less than 1, controlling the single-phase DCAC converter with the adjustable gain to work in a first working mode, wherein the single-phase DCAC converter with the adjustable gain works in a buck mode, in the first working mode, the third switching tube is kept to be turned off, and at the moment, the first switching tube, the third diode and the second switching tube work cooperatively to perform buck inversion, wherein the third diode and the second switching tube are driven the same, and the first working mode comprises two working states; in the first working state, the first switching tube is switched on, and the third diode and the second switching tube are switched off; in the second working state, the first switching tube is turned off, and the third diode and the second switching tube are turned on; when the desired gain is greater than 1, the single-phase DCAC converter with the adjustable gain cannot meet the working condition, and is switched to a second working mode, in the second working mode, the third diode and the second switching tube are kept turned off, the first switching tube, the first diode, the second diode, the third switching tube and the second inductor form a Buck circuit, and at the moment, the first switching tube and the third switching tube work cooperatively to carry out voltage reduction, and the second working mode comprises a first working state and a second working state; in the first working state, the first switching tube is switched on, and the third switching tube is switched off; and in the second working state, the first switching tube is switched off, and the third switching tube is switched on.
Further, the calculation formula of the gain of the first operation mode is VCoVin = D/(2D-1); and D is the duty ratio of the first switching tube, and 1-D is the duty ratio of the third diode and the second switching tube.
Further, the calculation formula of the gain of the second operation mode is VCoVin = D; and D is the duty ratio of the first switching tube.
The invention also provides a three-phase inverter, which comprises three single-phase DCAC converters with adjustable gains, wherein the three single-phase DCAC converters with adjustable gains are connected in parallel, and the alternating current output end of each single-phase DCAC converter with adjustable gains is used as the three-phase alternating current output end of the three-phase inverter.
Drawings
FIG. 1 is a prior art topology block diagram of a designated Semi-Z source inverter;
FIG. 2 is a prior art topology diagram of a designated Semi-quad-Z source inverter;
FIG. 3 is a topology diagram of a single-phase DCAC converter with adjustable gain according to the present invention;
FIG. 4 is a block diagram of a topology of a first operating mode of the gain adjustable single phase DCAC converter of FIG. 3;
FIG. 5 is a block diagram of a topology of a first operating state of the gain adjustable single phase DCAC converter of FIG. 4;
FIG. 6 is a block diagram of a second operating state of the gain adjustable single phase DCAC converter of FIG. 4;
FIG. 7 is a block diagram of a second mode of operation of the gain adjustable single phase DCAC converter of FIG. 3;
FIG. 8 is a block diagram of a topology of a first operating state of the gain adjustable single phase DCAC converter of FIG. 7;
FIG. 9 is a block diagram of a topology of a second operating state of the gain adjustable single phase DCAC converter of FIG. 7;
fig. 10 is a schematic diagram illustrating a control method of a single-phase DCAC converter with adjustable gain according to a second embodiment of the present invention;
fig. 11 is a topology structural view of a three-phase inverter in a third embodiment of the invention;
description of main circuit symbols:
| first inductor | L1 | First capacitor | C | Voltage across L2 | VL2 |
| Second inductor | L2 | Second capacitor | Co | Voltage across Co | VCo |
| First switch tube | S1 | Direct current power supply | DC | Voltage across C | VC |
| Third diode | S2 | Load voltage | Vo | DC supply voltage | Vin |
| Second switch tube | S3 | Load(s) | R | First diode | D1 |
| Third switch tube | S4 | Voltage across L1 | VL1 | Second diode | D2 |
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Several embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The invention provides a gain-adjustable single-phase DCAC converter, which comprises a direct-current power supply DC, a first inductor L1, a second inductor L2, a first switching tube S1, a bidirectional switch, a third switching tube S4, a first capacitor C, a second capacitor Co, a load R, a first diode D1 and a second diode D2, wherein the first inductor L1 is connected with the first capacitor C; the positive electrode of the direct current power supply DC is connected with the first end of the first switching tube S1; a second end of the first switch tube S1 is connected to an anode of the first diode D1, and a cathode of the first diode D1 is connected to a second end of the first capacitor C, a cathode of the second diode D2, and a first end of the second inductor L2, respectively; a first end of the first capacitor C is connected to a second end of the first inductor L1 and a first end of the bidirectional switch, respectively, and a second end of the bidirectional switch is connected to a second end of the second inductor L2, a first end of the second capacitor Co and a first end of the load R, respectively; the anode of the second diode D2 is connected to the second end of the third switching tube S4; the negative electrode of the direct current power supply DC, the first end of the first inductor L1, the first end of the third switching tube S4, the second end of the second capacitor Co, and the second end of the load R are all grounded.
When the gain to be achieved is less than 0 or the gain to be achieved is greater than 1, the single-phase DCAC converter works in a first working mode, namely the discontinuous inverter works in a voltage reduction mode, and when the gain to be achieved is less than 0 and less than 1, the discontinuous inverter cannot meet working conditions, the single-phase DCAC converter is switched to a second working mode, and the Buck circuit continues to work, so that high gain is achieved.
Specifically, in this embodiment, the bidirectional switch includes a third diode S2 and a second switch tube S3, a first end of the third diode S2 is connected to the second end of the first inductor L1 and the first end of the first capacitor C, a second end of the third diode S2 is connected to the first end of the second switch tube S3, and a second end of the second switch tube S3 is connected to the second end of the second inductor L2, the first end of the second capacitor Co, and the first end of the load R.
Specifically, in this embodiment, the first switching tube S1, the second switching tube S3, and the third switching tube S4 are all transistors to realize a switching function, and it should be understood that in other embodiments of the present invention, the first switching tube S1, the second switching tube S3, and the third switching tube S4 may all be any one of an IGBT, a MOSFET, or a transistor.
Specifically, in this embodiment, the third diode S2 and the second switching tube S3 are connected in series, and it is understood that in other embodiments of the present invention, the third diode S2 and the second switching tube S3 may be connected in either series or parallel.
Specifically, in this embodiment, the gain-adjustable single-phase DCAC converter includes a first operation mode, in the first operation mode, the third switching tube S4 is kept turned off, and at this time, the first switching tube S1, the third diode S2 and the second switching tube S3 cooperate to perform buck inversion, where the third diode S2 and the second switching tube S3 are driven the same, and the first operation mode includes two operation states; in the first operating state, the first switch tube S1 is turned on, and the third diode S2 and the second switch tube S3 are turned off, as shown in fig. 5. From kirchhoff's voltage law, Vin = VC+VL1，VL2+VCo= Vin; in the second working state, the first switch tube S1 is turned off, and the third diode S2 and the second switch tube S3 are turned on. As shown in fig. 6. At this time, V is obtained from kirchhoff's voltage lawL1=VCo，VC=VL2. Assuming that the duty cycle of the first switching tube S1 is D, the duty cycles of the third diode S2 and the second switching tube S3 are 1-D, and the following expression is obtained according to the volt-second balance:
D*(Vin−VC)+(1−D)VCo=0，
(Vin−VCo)*D+(1−D)VC=0；
can obtain VCo/Vin = D/(2D-1). It can be seen from the relational expression of the output voltage and the input voltage that when D is changed from 0 to 0.5, the negative gain is changed from 0 to negative infinity, and when D is changed from 0.5 to 1, the positive gain is changed from positive infinity to 1, so that the mode works in the discontinuous inversion mode, and the positive gain part of 0-1 is lacked.
Specifically, in this embodiment, the gain-adjustable single-phase DCAThe C converter includes a second operation mode, in the second operation mode, the third diode S2 and the second switching tube S3 are kept off, the first switching tube S1, the first diode D1, the second diode D2, the third switching tube S4, and the second inductor L2 form a Buck circuit, at this time, the first switching tube S1 and the third switching tube S4 cooperate to perform voltage reduction, and the second operation mode includes a first operation state and a second operation state; in the first operating state, the first switching tube S1 is turned on, and the third switching tube S4 is turned off, as shown in fig. 8, at this time, Vin = V can be obtained from kirchhoff' S voltage lawL2+VCo(ii) a In the second operating state, the first switching tube S1 is turned off, and the third switching tube S4 is turned on, as shown in fig. 9, which can be obtained from kirchhoff' S voltage law, VL2=−VCo. If the duty ratio of the first switching tube S1 is D, the duty ratio of the third switching tube S4 is 1-D, and the following expression, -V can be obtained according to the volt-second equilibrium law by combining the above expressionsCo*(1−D)+D(Vin−VCo) = 0; can obtain VCoand/Vin = D. It can be seen from the relational expression of the output voltage and the input voltage that as D changes from 0 to 1, the output ratio is less than 1, so the operation mode is in the forward buck mode. The second working mode is matched with the first working mode, so that the high-gain inverter can be realized, the second working mode supplements the part which is absent in the first working mode and has 0-1 positive direction, and the positive and negative bidirectional high gain is realized.
The invention also provides a control method of the gain-adjustable single-phase DCAC converter, which comprises the following steps: when the desired gain is less than 1, controlling the single-phase DCAC converter with adjustable gain to operate in a first operation mode, the single-phase DCAC converter with adjustable gain to operate in a buck mode, and in the first operation mode, the third switching tube S4 is kept turned off, and at this time, the first switching tube S1, the third diode S2 and the second switching tube S3 cooperate to perform buck inversion, where the third diode S2 and the second switching tube S3 are driven the same, and the first operation mode includes two operation states; in the first operating state, the first switching tube S1 is turned on, and the third diode 2 and the second switching tube S3 are turned off; in the second working state, the first switch tube S1 is turned off, and the third diode S2 and the second switch tube S3 are turned on.
As shown in fig. 5, in the first operating state, Vin = V, which is obtained from kirchhoff's voltage lawC+VL1，VL2+VCo= Vin; in the second working state, the first switch tube S1 is turned off, and the third diode S2 and the second switch tube S3 are turned on. As shown in fig. 6. At this time, V is obtained from kirchhoff's voltage lawL1=VCo，VC=VL2. Assuming that the duty cycle of the first switching tube S1 is D, the duty cycles of the third diode S2 and the second switching tube S3 are 1-D, and the following expression is obtained according to the volt-second balance:
D*(Vin−VC)+(1−D)VCo=0，
(Vin−VCo)*D+(1−D)VC=0；
can obtain VCo/Vin = D/(2D-1). It can be seen from the relational expression of the output voltage and the input voltage that when D is changed from 0 to 0.5, the negative gain is changed from 0 to negative infinity, and when D is changed from 0.5 to 1, the positive gain is changed from positive infinity to 1, so that the mode works in the discontinuous inversion mode, and the positive gain part of 0-1 is lacked.
When the desired gain is >1, the single-phase DCAC converter with adjustable gain cannot meet the operating condition, and switches the single-phase DCAC converter with adjustable gain to a second operating mode, in which the third diode S2 and the second switching tube S3 are kept off, the first switching tube S1, the first diode D1, the second diode D2, the third switching tube S4, and the second inductor L2 form a Buck circuit, and the first switching tube S1 and the third switching tube S4 cooperate to perform Buck, where the second operating mode includes a first operating state and a second operating state; in the first working state, the first switch tube S1 is turned on, and the third switch tube S4 is turned off; in the second working state, the first switching tube S1 is turned off, and the third switching tube S4 is turned on.
Specifically, as shown in fig. 8, in the first operating state, Vin = V can be obtained from kirchhoff's voltage lawL2+VCo(ii) a In the second working state, the first switching tube S1 is turned off, and the third switching tube S4 is turned on, as shown in fig. 9, where V is obtained from kirchhoff' S voltage lawL2=−VCo. If the duty ratio of the first switching tube S1 is D, the duty ratio of the third switching tube S4 is 1-D, and the following expression, -V can be obtained according to the volt-second balance law by combining the above expressionsCo*(1−D)+D(Vin−VCo) = 0; can obtain VCoand/Vin = D. It can be seen from the relational expression of the output voltage and the input voltage that as D changes from 0 to 1, the output ratio is less than 1, so the operation mode is in the forward buck mode. The second working mode is matched with the first working mode, so that the high-gain inverter can be realized, the second working mode supplements the part which is absent in the first working mode and has 0-1 positive direction, and the positive and negative bidirectional high gain is realized.
As shown in fig. 11, a three-phase inverter according to a third embodiment of the present invention includes three gain-adjustable single-phase DCAC converters described above, the three gain-adjustable single-phase DCAC converters are connected in parallel, and an ac output terminal of each gain-adjustable single-phase DCAC converter serves as a three-phase ac output terminal of the three-phase inverter. Specifically, it is assumed that voltages passing through the three loads R are a-phase voltage, B-phase voltage, and C-phase voltage of three-phase voltages, respectively. If the modulation wave for generating the A-phase voltage is Msin (ꞷ t), the modulation wave for generating the B-phase voltage is Msin (ꞷ t +2 pi/3) and the modulation wave for generating the C-phase voltage is Msin (ꞷ t-2 pi/3) according to the principle of three-phase inversion modulation, and each phase passes through the working modes of FIGS. 4 to 9, so that three-phase inversion can be realized.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A gain-adjustable single-phase DCAC converter is characterized by comprising a direct-current power supply, a first inductor, a second inductor, a first switch tube, a bidirectional switch, a third switch tube, a first capacitor, a second capacitor, a load, a first diode and a second diode;
the positive electrode of the direct current power supply is connected with the first end of the first switching tube;
the second end of the first switch tube is connected with the anode of the first diode, and the cathode of the first diode is respectively connected with the second end of the first capacitor, the cathode of the second diode and the first end of the second inductor;
a first end of the first capacitor is connected with a second end of the first inductor and a first end of the bidirectional switch respectively, and a second end of the bidirectional switch is connected with a second end of the second inductor, a first end of the second capacitor and a first end of the load respectively;
the anode of the second diode is connected with the second end of the third switching tube;
the negative electrode of the direct current power supply, the first end of the first inductor, the first end of the third switching tube, the second end of the second capacitor and the second end of the load are all grounded.
2. The gain-adjustable single-phase DCAC converter according to claim 1, wherein the bidirectional switch comprises a third diode and a second switch tube, a first terminal of the third diode is connected to the second terminal of the first inductor and the first terminal of the first capacitor, respectively, a second terminal of the third diode is connected to the first terminal of the second switch tube, and a second terminal of the second switch tube is connected to the second terminal of the second inductor, the first terminal of the second capacitor, and the first terminal of the load, respectively.
3. The gain-adjustable single-phase DCAC converter according to claim 2, wherein said first switch tube, said second switch tube and said third switch tube each comprise any one of IGBT, MOSFET and triode.
4. The gain-adjustable single-phase DCAC converter according to claim 2, wherein said third diode and said second switching tube are connected in any one of series connection and parallel connection.
5. The gain-adjustable single-phase DCAC converter according to claim 2, wherein the gain-adjustable single-phase DCAC converter comprises a first operation mode, in which the third switching tube is kept turned off, and the first switching tube, the third diode and the second switching tube cooperate to perform buck inversion, wherein the third diode and the second switching tube are driven the same, and the first operation mode comprises two operation states;
in a first working state, the first switching tube is switched on, and the third diode and the second switching tube are switched off;
and in a second working state, the first switch tube is switched off, and the third diode and the second switch tube are switched on.
6. The gain-adjustable single-phase DCAC converter according to claim 2, wherein the gain-adjustable single-phase DCAC converter comprises a second operation mode, in which the third diode and the second switch tube are kept off, and the first switch tube, the first diode, the second diode, the third switch tube and the second inductor form a Buck circuit, and the Buck circuit is configured by the first switch tube and the third switch tube working together to perform Buck, and the second operation mode comprises a first operation state and a second operation state;
in the first working state, the first switching tube is switched on, and the third switching tube is switched off;
and in the second working state, the first switching tube is switched off, and the third switching tube is switched on.
7. A method for controlling a gain-adjustable single-phase DCAC converter, comprising:
when the desired gain is less than 1, controlling the single-phase DCAC converter with the adjustable gain to work in a first working mode, wherein the single-phase DCAC converter with the adjustable gain works in a step-down mode, and in the first working mode, the third switching tube is kept turned off, and at the moment, the first switching tube, the third diode and the second switching tube work cooperatively to perform step-down inversion, wherein the third diode and the second switching tube are driven to be the same, and the first working mode comprises two working states; in a first working state, the first switching tube is switched on, and the third diode and the second switching tube are switched off; in a second working state, the first switching tube is turned off, and the third diode and the second switching tube are turned on;
when the desired gain is greater than 1, the single-phase DCAC converter with the adjustable gain cannot meet the working condition, and is switched to a second working mode, in the second working mode, the third diode and the second switching tube are kept turned off, the first switching tube, the first diode, the second diode, the third switching tube and the second inductor form a Buck circuit, and at the moment, the first switching tube and the third switching tube work cooperatively to carry out voltage reduction, and the second working mode comprises a first working state and a second working state; in the first working state, the first switching tube is switched on, and the third switching tube is switched off; and in the second working state, the first switching tube is switched off, and the third switching tube is switched on.
8. The method as claimed in claim 7, wherein the gain of the first operation mode is calculated as VCo/Vin=D/(2D−1)；
And D is the duty ratio of the first switching tube, and 1-D is the duty ratio of the third diode and the second switching tube.
9. The method as claimed in claim 7, wherein the gain of the second operation mode is calculated as VCo/Vin=D；
And D is the duty ratio of the first switching tube.
10. A three-phase inverter comprising three gain-adjustable single-phase DCAC converters according to any one of claims 1 to 6, wherein the three gain-adjustable single-phase DCAC converters are connected in parallel, and the ac output terminal of each of the gain-adjustable single-phase DCAC converters serves as the three-phase ac output terminal of the three-phase inverter.
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