CN111245270A - Inverter and five-level circuit thereof - Google Patents
Inverter and five-level circuit thereof Download PDFInfo
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- CN111245270A CN111245270A CN202010190813.7A CN202010190813A CN111245270A CN 111245270 A CN111245270 A CN 111245270A CN 202010190813 A CN202010190813 A CN 202010190813A CN 111245270 A CN111245270 A CN 111245270A
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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
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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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
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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- Dc-Dc Converters (AREA)
Abstract
The application discloses an inverter power supply and a five-level circuit thereof, wherein the five-level circuit comprises a generator, four boost/buck circuits and four voltage-stabilizing capacitors; the positive output end of the generator is connected with the first voltage-stabilizing capacitor through the first boost/buck circuit and is connected with the second voltage-stabilizing capacitor through the second boost/buck circuit; the negative output end of the generator is connected with the third voltage-stabilizing capacitor through a third boost/buck circuit and is connected with the fourth voltage-stabilizing capacitor through a fourth boost/buck circuit; each boost/buck circuit is used for ensuring the five-level output of the five-level circuit and the stable ratio of the standard level to the level output of the five-level circuit, and the level output of the five-level circuit comprises a connecting end of each boost/buck circuit and a corresponding voltage-stabilizing capacitor and a neutral point of a positive output end and a negative output end of the generator. The voltage stability of the output level is effectively improved, the current waveform distortion is reduced, and the voltage resistance safety of the switching device is guaranteed.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to an inverter power supply and a five-level circuit thereof.
Background
Common clean energy sources include photovoltaic power generation, wind power generation and the like. As a replacement and supplement of thermal power generation, clean energy power generation can play a role when the grid pressure is high and even faults occur. The electric energy output by the generator of the clean energy can be supplied to users after being subjected to voltage boosting, voltage reducing and inversion processing.
The five-level circuit is a common circuit topology level standard and is also commonly applied to an inverter power supply which utilizes clean energy to generate power. Limited by natural conditions, generators using clean energy often have unstable output. For example, the output voltage of a photovoltaic generator utilizing solar power is unstable due to the magnitude of the illumination intensity. In the prior art, the positive and negative output voltages of the generator are often directly used as two level states in five levels, so that the circuit voltage changes along with the change of natural conditions, the stability is poor, the controllability is low, and the current waveform distortion is more easily generated.
In view of the above, it is an important need for those skilled in the art to provide a solution to the above technical problems.
Disclosure of Invention
The application aims to provide an inverter power supply and a five-level circuit thereof, so that the stability of output voltage is effectively improved, the current waveform distortion is reduced, and the economic benefit of products is improved.
In order to solve the technical problem, in a first aspect, the application discloses a five-level circuit, which comprises a generator, four boost/buck circuits and four voltage stabilizing capacitors;
the positive output end of the generator is connected with the first voltage-stabilizing capacitor after passing through the first boost/buck circuit and is connected with the second voltage-stabilizing capacitor after passing through the second boost/buck circuit;
the negative output end of the generator is connected with a third voltage-stabilizing capacitor after passing through a third boost/buck circuit and is connected with a fourth voltage-stabilizing capacitor after passing through a fourth boost/buck circuit;
each boost/buck circuit is used for ensuring that a level output end of each five-level circuit respectively outputs five levels with a stable ratio to a standard level, and the level output end of each five-level circuit comprises a connection end of each boost/buck circuit and a corresponding voltage stabilizing capacitor and a neutral point of the positive output end and the negative output end of the generator.
Optionally, a fifth capacitor and a sixth capacitor are further included;
the fifth capacitor and the sixth capacitor are connected in series to form a series branch, and the series branch is connected between the positive output end and the negative output end of the generator; and the connection end of the fifth capacitor and the sixth capacitor is the neutral point.
Optionally, the other end of each voltage-stabilizing capacitor is connected to the neutral point.
Optionally, a capacitance value of the first voltage-stabilizing capacitor is equal to a capacitance value of the fourth voltage-stabilizing capacitor and is greater than a capacitance value of the second voltage-stabilizing capacitor; and the capacitance value of the second voltage-stabilizing capacitor is equal to that of the third voltage-stabilizing capacitor.
Optionally, the other end of the second voltage-stabilizing capacitor and the other end of the third voltage-stabilizing capacitor are both connected with the neutral point;
the other end of the first voltage stabilizing capacitor is connected between the second boost/buck circuit and the second voltage stabilizing capacitor; the other end of the fourth voltage-stabilizing capacitor is connected between the third boost/buck circuit and the third voltage-stabilizing capacitor.
Optionally, the capacitance values of the first voltage-stabilizing capacitor to the fourth voltage-stabilizing capacitor are all equal.
Optionally, the ratio of the five levels output by the connection end of the first boost/buck circuit and the first voltage-stabilizing capacitor, the connection end of the second boost/buck circuit and the second voltage-stabilizing capacitor, the neutral point, the connection end of the third boost/buck circuit and the third voltage-stabilizing capacitor, and the connection end of the fourth boost/buck circuit and the fourth voltage-stabilizing capacitor to the standard level is sequentially:
2、1、0、-1、-2。
in a second aspect, the present application further discloses an inverter power supply, which includes any one of the five-level circuits described above, and a five-level inverter circuit connected to each level output terminal of the five-level circuit.
The five-level circuit comprises a generator, four boost/buck circuits and four voltage-stabilizing capacitors; the positive output end of the generator is connected with the first voltage-stabilizing capacitor after passing through the first boost/buck circuit and is connected with the second voltage-stabilizing capacitor after passing through the second boost/buck circuit; the negative output end of the generator is connected with a third voltage-stabilizing capacitor after passing through a third boost/buck circuit and is connected with a fourth voltage-stabilizing capacitor after passing through a fourth boost/buck circuit; each boost/buck circuit is used for ensuring that a level output end of each five-level circuit respectively outputs five levels with a stable ratio to a standard level, and the level output end of each five-level circuit comprises a connection end of each boost/buck circuit and a corresponding voltage stabilizing capacitor and a neutral point of the positive output end and the negative output end of the generator.
It can be seen that, among five level output ends of the five-level circuit provided by the application, except for the zero level output end, other level output ends are all based on the corresponding boost/buck circuit to perform stable buck-boost output, so that the voltage stability of the output level can be effectively improved, and further the current waveform distortion is reduced, the harmonic wave is eliminated, and the economic benefit of the product is improved. And the stability of the output level of the five-level circuit also provides protection for the withstand voltage safety of a power switch device in a rear-connected inverter circuit, so that the device is effectively prevented from being damaged by high voltage during voltage fluctuation, and the safety and stability of the system during working are improved. The inverter power supply provided by the application also has the beneficial effects.
Drawings
In order to more clearly illustrate the technical solutions in the prior art and the embodiments of the present application, the drawings that are needed to be used in the description of the prior art and the embodiments of the present application will be briefly described below. Of course, the following description of the drawings related to the embodiments of the present application is only a part of the embodiments of the present application, and it will be obvious to those skilled in the art that other drawings can be obtained from the provided drawings without any creative effort, and the obtained other drawings also belong to the protection scope of the present application.
Fig. 1 is a circuit structure diagram of a five-level circuit disclosed in an embodiment of the present application;
fig. 2 is a circuit structure diagram of another five-level circuit disclosed in the embodiment of the present application.
Detailed Description
The core of the application lies in providing a five-level circuit and an inverter power supply so as to effectively improve the stability of output voltage, further reduce the current waveform distortion and improve the economic benefit of products.
In order to more clearly and completely describe the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
At present, a five-level circuit is a common circuit topology level standard, and is also commonly applied to an inverter power supply for generating power by utilizing clean energy. Limited by natural conditions, generators using clean energy often have unstable output. For example, the output voltage of a photovoltaic generator utilizing solar power is unstable due to the magnitude of the illumination intensity. In the prior art, the positive and negative output voltages of the generator are often directly used as two level states in five levels, so that the circuit voltage changes along with the change of natural conditions, the stability is poor, the controllability is low, and the current waveform distortion is more easily generated. In view of this, the present application provides a technical solution to effectively solve the above problems.
Referring to fig. 1, the embodiment of the application discloses a five-level circuit, which includes a generator, four boost/buck circuits and four voltage-stabilizing capacitors;
the positive output end of the generator is connected with a first voltage-stabilizing capacitor C1 after passing through a first boost/buck circuit, and is connected with a second voltage-stabilizing capacitor C2 after passing through a second boost/buck circuit;
the negative output end of the generator is connected with a third voltage-stabilizing capacitor C3 after passing through a third boost/buck circuit, and is connected with a fourth voltage-stabilizing capacitor C4 after passing through a fourth boost/buck circuit;
each boost/buck circuit is used for ensuring that the level output end of the five-level circuit respectively outputs five levels with stable ratio to the standard level; the level output end of the five-level circuit comprises a connection end of each boost/buck circuit and a corresponding voltage-stabilizing capacitor, and a neutral point of a positive output end and a negative output end of the generator.
For convenience of description, a connection terminal of the first boost/buck circuit and the first voltage-stabilizing capacitor C1 may be referred to as a first level output terminal of the five-level circuit, a connection terminal of the second boost/buck circuit and the second voltage-stabilizing capacitor C2 may be referred to as a second level output terminal of the five-level circuit, a neutral point may be referred to as a third level output terminal of the five-level circuit, a connection terminal of the third boost/buck circuit and the third voltage-stabilizing capacitor C3 may be referred to as a fourth level output terminal of the five-level circuit, and a connection terminal of the fourth boost/buck circuit and the fourth voltage-stabilizing capacitor C4 may be referred to as a fifth level output terminal of the five-level circuit.
The generator in the present application may specifically be a photovoltaic generator that utilizes solar power generation. Due to the influence of external conditions, the output voltage of the photovoltaic generator can be unstable and uncontrolled, which is not favorable for the stability of the power supply system. Therefore, the four boost/buck circuits are specifically used in the five-level circuit, so that the output level of each level output end is stabilized, and the voltage output stability is not influenced by large offset.
As a specific embodiment, the ratio of the fifth level output by the first level output terminal, the second level output terminal, the third level output terminal, the fourth level output terminal, and the fifth level output terminal to the standard level (which may be specifically the second level output by the second level output terminal) may be sequentially: 2. 1, 0, -1, -2. That is, if the second level outputted from the second level output terminal is denoted by E, the five levels outputted from the first level output terminal to the fifth level output terminal may be specifically 2E, E, 0, -E, -2E.
In the five-level circuit provided by the application, based on the voltage stabilization output function of the four boost/buck circuits, the output voltage of the second level output end is effectively and stably determined as E by taking the second level output end as an example, and the situations that the output level is too high (such as 1.5E) or too low (such as 0.2E) and the like are avoided.
As a specific embodiment, the five-level circuit provided in the embodiment of the present application may further include a fifth capacitor C5 and a sixth capacitor C6, and a neutral point may be obtained based on the two capacitors: the fifth capacitor C5 and the sixth capacitor C6 are connected in series to form a series branch, and the series branch is connected between the positive output end and the negative output end of the generator; the connection end of the fifth capacitor C5 and the sixth capacitor C6 is a neutral point.
It is easy to understand that the capacitance values of the fifth capacitor C5 and the sixth capacitor C6 are equal to ensure the balance of positive and negative levels.
Specifically, it should be particularly noted that the five-level circuit provided in the embodiment of the present application specifically includes four boost/buck circuits, and except for the zero-level output terminal (i.e., the neutral point), the levels output by the other four level output terminals are all voltages processed by the boost/buck circuits, so that even if the positive and negative output voltages of the generator change with the change of natural conditions, the four levels output by the four boost/buck circuits will remain stable, thereby effectively reducing the distortion of the current waveform and improving the power quality.
Of course, it is easily understood that the output levels of the four boost/buck circuits are different, and the specific operation control states are not completely the same.
Besides, the zero level output end, the other four level output ends are connected with voltage stabilizing capacitors so as to further stabilize output. It is easy to understand that the other ends of the four voltage-stabilizing capacitors are respectively connected with corresponding reference terminals, and those skilled in the art can select the reference terminal potentials of the four voltage-stabilizing capacitors according to actual situations. Different reference terminal potentials can make the same voltage stabilizing capacitor bear different voltage differences, and a person skilled in the art can select the voltage stabilizing capacitor with the corresponding capacitance value according to the voltage differences.
As a specific embodiment, the reference terminal of each voltage-stabilizing capacitor may be selected as a neutral point with zero potential, so that each voltage-stabilizing capacitor has a parallel structure. Specifically, referring to fig. 1, the other end of each voltage-stabilizing capacitor, which is not connected to the corresponding boost/buck circuit, is connected to the neutral point.
Therefore, ideally, the voltage difference between the two ends of the first voltage-stabilizing capacitor C1 and the fourth voltage-stabilizing capacitor C4 is 2E, and the voltage difference between the two ends of the second voltage-stabilizing capacitor C2 and the third voltage-stabilizing capacitor C3 is E. Because the voltage difference between the first voltage-stabilizing capacitor C1 and the fourth voltage-stabilizing capacitor C4 is large, the capacitance of the first voltage-stabilizing capacitor C1 can be made equal to the capacitance of the fourth voltage-stabilizing capacitor C4 and larger than the capacitance of the second voltage-stabilizing capacitor C2; and the capacitance value of the second voltage-stabilizing capacitor C2 is equal to that of the third voltage-stabilizing capacitor C3.
Of course, besides the arrangement of the reference terminal potential shown in fig. 1, those skilled in the art can also set the reference terminal potential for the four voltage-stabilizing capacitors in series. Specifically, referring to fig. 2, fig. 2 is a circuit structure diagram of another five-level circuit disclosed in the embodiment of the present application. In this embodiment, the other end of the second voltage-stabilizing capacitor C2 and the other end of the third voltage-stabilizing capacitor C3 are both connected to a neutral point; the other end of the first voltage-stabilizing capacitor C1 is connected between the second boost/buck circuit and the second voltage-stabilizing capacitor C2; the other end of the fourth voltage-stabilizing capacitor C4 is connected between the third boost/buck circuit and the third voltage-stabilizing capacitor C3.
Therefore, ideally, the voltage difference received by the second voltage-stabilizing capacitor C2 is E, the voltage difference received by the first voltage-stabilizing capacitor C1 is E, and the voltage difference received by both capacitors after they are connected in series is 2E. The third trim capacitor C3 is similar to the fourth trim capacitor C4. Since the voltage differences of the four voltage-stabilizing capacitors are the same, the same capacitance values can be specifically selected, that is, the capacitance values of the first voltage-stabilizing capacitor C1 to the fourth voltage-stabilizing capacitor C4 can be all the same.
In addition, it should be noted that the generator in the five-level circuit provided in the embodiment of the present application may specifically be a photovoltaic generator that generates power by using light energy, and may also be a wind energy generator that generates power by using wind energy, and the like, which is not further limited in the embodiment of the present application.
The five-level circuit provided by the embodiment of the application comprises: the system comprises a generator, four boost/buck circuits and four voltage stabilizing capacitors; the positive output end of the generator is connected with a first voltage-stabilizing capacitor C1 after passing through a first boost/buck circuit, and is connected with a second voltage-stabilizing capacitor C2 after passing through a second boost/buck circuit; the negative output end of the generator is connected with a third voltage-stabilizing capacitor C3 after passing through a third boost/buck circuit, and is connected with a fourth voltage-stabilizing capacitor C4 after passing through a fourth boost/buck circuit; each boost/buck circuit is used for ensuring that the level output end of the five-level circuit respectively outputs five levels with stable ratio to the standard level; the level output end of the five-level circuit comprises a connection end of each boost/buck circuit and a corresponding voltage-stabilizing capacitor, and a neutral point of a positive output end and a negative output end of the generator.
It can be seen that, among five level output ends of the five-level circuit provided by the application, except for the zero level output end, other level output ends are all based on the corresponding boost/buck circuit to perform stable buck-boost output, so that the voltage stability of the output level can be effectively improved, and further the current waveform distortion is reduced, the harmonic wave is eliminated, and the economic benefit of the product is improved. And the stability of the output level of the five-level circuit also provides protection for the withstand voltage safety of a power switch device in a rear-connected inverter circuit, so that the device is effectively prevented from being damaged by high voltage during voltage fluctuation, and the safety and stability of the system during working are improved.
Further, the embodiment of the application also discloses an inverter power supply, which comprises any one of the five-level circuits and a five-level inverter circuit connected with each level output end of the five-level circuit.
Specifically, each input end of the five-level inverter circuit is connected with each level output end of the five-level circuit, and is used for inverting the direct current output by the five-level circuit into alternating current for users to use. In this embodiment, a circuit topology of the five-level inverter circuit may be selected by a person skilled in the art according to an actual application, which is not further limited in this application.
Therefore, except for the zero level output end, the other level output ends of the five-level circuit of the inverter power supply disclosed by the embodiment of the application perform stable buck-boost output based on the corresponding boost/buck circuit, so that the voltage stability of the output level can be effectively improved, the current waveform distortion is reduced, the harmonic distortion is eliminated, and the economic benefit of the product is improved. And the stability of the output level of the five-level circuit also provides protection for the withstand voltage safety of a power switch device in a rear-connected inverter circuit, so that the device is effectively prevented from being damaged by high voltage during voltage fluctuation, and the safety and stability of the system during working are improved.
For the details of the inverter, reference may be made to the detailed description of the five-level circuit, which is not repeated herein.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the equipment disclosed by the embodiment, the description is relatively simple because the equipment corresponds to the method disclosed by the embodiment, and the relevant parts can be referred to the method part for description.
It is further noted that, throughout this document, relational terms such as "first" and "second" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The technical solutions provided by the present application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall into the protection scope of the present application.
Claims (8)
1. A five-level circuit is characterized by comprising a generator, four boost/buck circuits and four voltage stabilizing capacitors;
the positive output end of the generator is connected with the first voltage-stabilizing capacitor after passing through the first boost/buck circuit and is connected with the second voltage-stabilizing capacitor after passing through the second boost/buck circuit;
the negative output end of the generator is connected with a third voltage-stabilizing capacitor after passing through a third boost/buck circuit and is connected with a fourth voltage-stabilizing capacitor after passing through a fourth boost/buck circuit;
each boost/buck circuit is used for ensuring that a level output end of each five-level circuit respectively outputs five levels with a stable ratio to a standard level, and the level output end of each five-level circuit comprises a connection end of each boost/buck circuit and a corresponding voltage stabilizing capacitor and a neutral point of the positive output end and the negative output end of the generator.
2. The five-level circuit according to claim 1, further comprising a fifth capacitor and a sixth capacitor;
the fifth capacitor and the sixth capacitor are connected in series to form a series branch, and the series branch is connected between the positive output end and the negative output end of the generator; and the connection end of the fifth capacitor and the sixth capacitor is the neutral point.
3. The five-level circuit according to claim 1, wherein the other end of each voltage stabilizing capacitor is connected to the neutral point.
4. The five-level circuit according to claim 3, wherein the capacitance of the first voltage-stabilizing capacitor is equal to the capacitance of the fourth voltage-stabilizing capacitor and is greater than the capacitance of the second voltage-stabilizing capacitor; and the capacitance value of the second voltage-stabilizing capacitor is equal to that of the third voltage-stabilizing capacitor.
5. The five-level circuit according to claim 1, wherein the other end of the second voltage-stabilizing capacitor and the other end of the third voltage-stabilizing capacitor are connected to the neutral point;
the other end of the first voltage stabilizing capacitor is connected between the second boost/buck circuit and the second voltage stabilizing capacitor; the other end of the fourth voltage-stabilizing capacitor is connected between the third boost/buck circuit and the third voltage-stabilizing capacitor.
6. The five-level circuit according to claim 5, wherein the first to fourth voltage-stabilizing capacitors have equal capacitance values.
7. The five-level circuit according to any one of claims 1 to 6, wherein the ratio of the five levels output by the connection end of the first boost/buck circuit and the first voltage-stabilizing capacitor, the connection end of the second boost/buck circuit and the second voltage-stabilizing capacitor, the neutral point, the connection end of the third boost/buck circuit and the third voltage-stabilizing capacitor, and the connection end of the fourth boost/buck circuit and the fourth voltage-stabilizing capacitor to the standard level is, in turn:
2、1、0、-1、-2。
8. an inverter power supply comprising a five-level circuit according to any one of claims 1 to 7, and a five-level inverter circuit connected to each level output terminal of the five-level circuit.
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| CN202010190813.7A CN111245270A (en) | 2020-03-18 | 2020-03-18 | Inverter and five-level circuit thereof |
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| CN202010190813.7A CN111245270A (en) | 2020-03-18 | 2020-03-18 | Inverter and five-level circuit thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101938136A (en) * | 2009-07-01 | 2011-01-05 | 昆明普罗米能源科技有限公司 | Photovoltaic component DC grid-connection controller |
| CN102769402A (en) * | 2012-07-31 | 2012-11-07 | 阳光电源股份有限公司 | Inverting unit and five-level inverter with same |
| CN104485808A (en) * | 2014-12-18 | 2015-04-01 | 阳光电源股份有限公司 | Input voltage control method and system of five-level photovoltaic inverter |
| CN105186900A (en) * | 2015-08-31 | 2015-12-23 | 上海正泰电源系统有限公司 | Five-level transformerless inverter circuit |
-
2020
- 2020-03-18 CN CN202010190813.7A patent/CN111245270A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101938136A (en) * | 2009-07-01 | 2011-01-05 | 昆明普罗米能源科技有限公司 | Photovoltaic component DC grid-connection controller |
| CN102769402A (en) * | 2012-07-31 | 2012-11-07 | 阳光电源股份有限公司 | Inverting unit and five-level inverter with same |
| CN104485808A (en) * | 2014-12-18 | 2015-04-01 | 阳光电源股份有限公司 | Input voltage control method and system of five-level photovoltaic inverter |
| CN105186900A (en) * | 2015-08-31 | 2015-12-23 | 上海正泰电源系统有限公司 | Five-level transformerless inverter circuit |
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