CN113572385A - Inverter circuit - Google Patents
Inverter circuit Download PDFInfo
- Publication number
- CN113572385A CN113572385A CN202110669799.3A CN202110669799A CN113572385A CN 113572385 A CN113572385 A CN 113572385A CN 202110669799 A CN202110669799 A CN 202110669799A CN 113572385 A CN113572385 A CN 113572385A
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- China
- Prior art keywords
- vertical bridge
- bus
- inverter circuit
- suppression devices
- bridge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000001629 suppression Effects 0.000 claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims abstract description 15
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Images
Classifications
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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
- H02M7/5387—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 in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to an inverter circuit which is connected with a bus and adopts an H6 topological structure or an H6 derived topological structure, and comprises a first vertical bridge and a second vertical bridge which are formed by connecting switching tubes in series, the inverter circuit also comprises two suppression devices for suppressing a resonance phenomenon caused by the difference of the disconnection speed of the switching tubes in the first vertical bridge or the second vertical bridge, and the two suppression devices are respectively bridged between the first vertical bridge and the bus and between the second vertical bridge and the bus. The two suppression devices are respectively bridged between the output node of the first vertical bridge and the middle point of the bus and between the output node of the second vertical bridge and the middle point of the bus. The two suppression devices are two capacitors. The invention can inhibit the resonance problem caused by the difference of the turn-off speed of the internal switching tube when the circuit works normally.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to an inverter circuit applied to industries such as photovoltaic power generation and the like.
Background
The traditional H6 topology of the inverter circuit is shown in figure 1, and comprises a first vertical bridge and a second vertical bridge, wherein the first vertical bridge is formed by serially connecting switching tubes S1, S2 and S5, the second vertical bridge is formed by serially connecting switching tubes S3, S4 and S6, and two freewheeling diodes D1 and D2 are connected between the first vertical bridge and the second vertical bridge. In the first half cycle of the inversion output, the switching tubes S1, S4, and S6 are closed, as shown in fig. 2, and then a freewheeling stage is performed, at this time, the switching tubes S1 and S4 are simultaneously turned off, as shown in fig. 3, because the turning-off speeds of the switching tubes S1 and S4 cannot be completely consistent in actual operation, for example, the turning-off speed of the switching tube S4 is faster than that of the switching tube S1, when the switching tube S4 is turned off first, the voltages on the bus, the first vertical bridge, and the second vertical bridge will rise, and after the switching tube S2 is turned off, the voltages will fall back, so that a resonance phenomenon will occur in the process, thereby affecting the electromagnetic disturbance performance of the system, and causing the exceeding of the result of the conduction and radiation test items of EMC.
Disclosure of Invention
The invention aims to provide an inverter circuit capable of suppressing resonance problems caused by switching speed differences.
In order to achieve the purpose, the invention adopts the technical scheme that:
an inverter circuit is connected with a bus and adopts an H6 topological structure or an H6 derived topological structure, and comprises a first vertical bridge and a second vertical bridge which are formed by connecting switching tubes in series, the inverter circuit also comprises two suppression devices used for suppressing resonance phenomena caused by the difference of the disconnection speeds of the switching tubes in the first vertical bridge or the second vertical bridge, and the two suppression devices are respectively bridged between the first vertical bridge and the bus and between the second vertical bridge and the bus.
The two suppression devices are respectively bridged between the output node of the first vertical bridge and the middle point of the bus and between the output node of the second vertical bridge and the middle point of the bus.
Two of the suppression devices are two capacitors.
The first vertical bridge and the second vertical bridge respectively comprise three switching tubes connected in series, and two freewheeling diodes are connected between the first vertical bridge and the second vertical bridge.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the invention can inhibit the resonance problem caused by the difference of the turn-off speed of the internal switching tube when the circuit works normally.
Drawings
Fig. 1 is a circuit diagram of an H6 topology inverter.
Fig. 2 is a circuit diagram of the H6 topology inverter in the first half cycle of inversion.
Fig. 3 is a circuit diagram of an H6 topology inverter in a freewheeling state.
Fig. 4 is a circuit diagram of an inverter circuit of the present invention.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings to which the invention is attached.
The first embodiment is as follows: as shown in fig. 4, an inverter circuit adopts an H6 topology or an H6 derived topology, and in this embodiment, an H6 topology is taken as an example for description.
The inverter circuit is connected with a bus, the bus is connected with the photovoltaic module PV, the capacitor C1 and the capacitor C2 are connected to the bus, and a midpoint of the bus is formed between the capacitor C1 and the capacitor C2.
The inverter circuit comprises a first vertical bridge and a second vertical bridge which are connected with two ends of the bus, the first vertical bridge and the second vertical bridge respectively comprise three switch tubes which are connected in series, namely the first vertical bridge comprises a switch tube S1, a switch tube S5 and a switch tube S2 which are sequentially connected in series, and the second vertical bridge comprises a switch tube S3, a switch tube S6 and a switch tube S4 which are sequentially connected in series. For the first vertical bridge, the junction of switch S1 and switch S5 forms the output node, and for the second vertical bridge, the junction of switch S3 and switch S6 forms the output node. Two freewheeling diodes, namely a freewheeling diode D1 and a freewheeling diode D2, are further connected between the first vertical bridge and the second vertical bridge, the anode of the freewheeling diode D1 is connected with the connection point of the switch tube S5 and the switch tube S2 on the second vertical bridge, the cathode of the freewheeling diode D1 is connected with the output node of the first vertical bridge, the anode of the freewheeling diode D2 is connected with the connection point of the switch tube S5 and the switch tube S2 on the first vertical bridge, and the cathode of the freewheeling diode D2 is connected with the output node of the second vertical bridge.
The inverter circuit further comprises two suppression devices for suppressing resonance phenomena caused by the difference of the disconnection speeds of the switching tubes in the first vertical bridge or the second vertical bridge, wherein the two suppression devices are respectively bridged between the first vertical bridge and the bus and between the second vertical bridge and the bus, and the suppression device specifically comprises: the two suppression devices are respectively bridged between the output node of the first vertical bridge and the middle point of the bus and between the output node of the second vertical bridge and the middle point of the bus. The two suppression devices are two capacitors, namely a capacitor C3 and a capacitor C4, two ends of the capacitor C3 are respectively connected with the output node of the first vertical bridge and the midpoint of the bus, and two ends of the capacitor C4 are respectively connected with the output node of the second vertical bridge and the midpoint of the bus. Under the freewheeling state, in the process of switching off the switching tube S1 and the switching tube S4, the capacitor C3 can stabilize the voltage difference generated by the difference of the switching-off speeds of the two switching tubes, thereby avoiding the occurrence of the resonance phenomenon and effectively avoiding the EMC problem caused by the resonance phenomenon. Similarly, in the process of disconnecting the switch tube S2 and the switch tube S3, the capacitor C4 can stabilize the voltage difference generated by the difference in the disconnection speeds of the two switch tubes, so as to stabilize the voltage in the negative half period of the alternating current of the direct current, thereby preventing the occurrence of the resonance phenomenon.
The inverter circuit is characterized in that a cross-over capacitor is added to a bus at the output position of a vertical bridge of an H6 topology, so that the resonance problem caused by the difference of the switch-off speeds of the switches under the normal operation of the power circuit is suppressed.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (4)
1. An inverter circuit is connected with a bus and adopts an H6 topological structure or an H6 derived topological structure, and comprises a first vertical bridge and a second vertical bridge which are formed by connecting switch tubes in series, and is characterized in that: the inverter circuit further comprises two suppression devices for suppressing resonance phenomena caused by the difference of the switching speeds of the switching tubes in the first vertical bridge or the second vertical bridge, and the two suppression devices are respectively bridged between the first vertical bridge and the bus and between the second vertical bridge and the bus.
2. The inverter circuit according to claim 1, wherein: the two suppression devices are respectively bridged between the output node of the first vertical bridge and the middle point of the bus and between the output node of the second vertical bridge and the middle point of the bus.
3. An inverter circuit according to claim 1 or 2, wherein: two of the suppression devices are two capacitors.
4. The inverter circuit according to claim 1, wherein: the first vertical bridge and the second vertical bridge respectively comprise three switching tubes connected in series, and two freewheeling diodes are connected between the first vertical bridge and the second vertical bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110669799.3A CN113572385A (en) | 2021-06-17 | 2021-06-17 | Inverter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110669799.3A CN113572385A (en) | 2021-06-17 | 2021-06-17 | Inverter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113572385A true CN113572385A (en) | 2021-10-29 |
Family
ID=78162348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110669799.3A Pending CN113572385A (en) | 2021-06-17 | 2021-06-17 | Inverter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113572385A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410102A (en) * | 2014-11-20 | 2015-03-11 | 上海追日电气有限公司 | Multi-H6-bridge grid-connected inverter doubling circuit |
| CN108736489A (en) * | 2018-05-31 | 2018-11-02 | 中国电子科技集团公司第四十研究所 | A kind of powerless control method of the single-phase H6 bridge inverter circuits of non-isolation type |
| CN110247571A (en) * | 2019-05-31 | 2019-09-17 | 华为技术有限公司 | A kind of inverter circuit, inverter and photovoltaic generating system |
| CN112865171A (en) * | 2020-12-31 | 2021-05-28 | 江苏固德威电源科技股份有限公司 | Photovoltaic grid-connected inverter |
-
2021
- 2021-06-17 CN CN202110669799.3A patent/CN113572385A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410102A (en) * | 2014-11-20 | 2015-03-11 | 上海追日电气有限公司 | Multi-H6-bridge grid-connected inverter doubling circuit |
| CN108736489A (en) * | 2018-05-31 | 2018-11-02 | 中国电子科技集团公司第四十研究所 | A kind of powerless control method of the single-phase H6 bridge inverter circuits of non-isolation type |
| CN110247571A (en) * | 2019-05-31 | 2019-09-17 | 华为技术有限公司 | A kind of inverter circuit, inverter and photovoltaic generating system |
| CN112865171A (en) * | 2020-12-31 | 2021-05-28 | 江苏固德威电源科技股份有限公司 | Photovoltaic grid-connected inverter |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 215000 No. 90, Zijin Road, high tech Zone, Suzhou, Jiangsu Applicant after: Goodway Technology Co.,Ltd. Address before: No. 90, Zijin Road, high tech Zone, Suzhou City, Jiangsu Province, 215011 Applicant before: JIANGSU GOODWE POWER SUPPLY TECHNOLOGY Co.,Ltd. |
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| CB02 | Change of applicant information | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211029 |
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| RJ01 | Rejection of invention patent application after publication |