CN204615690U - Be applied to the single-phase low-power inverter of photovoltaic generating system - Google Patents
Be applied to the single-phase low-power inverter of photovoltaic generating system Download PDFInfo
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- CN204615690U CN204615690U CN201520301301.8U CN201520301301U CN204615690U CN 204615690 U CN204615690 U CN 204615690U CN 201520301301 U CN201520301301 U CN 201520301301U CN 204615690 U CN204615690 U CN 204615690U
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Abstract
The utility model relates to a kind of single-phase low-power inverter being applied to photovoltaic generating system, comprise direct current input source, topological structure, two output is through two inductance access electrical networks, topological structure comprises the first power device, second power device, 3rd power device and the 4th power device, first power device and the second power device are connected in series mutually and are connected between the positive and negative terminal of direct current input source, 3rd power device and the 4th power device are connected in series mutually and are connected between the positive and negative terminal of direct current input source, the common end of the first power device and the second power device is an output of single-phase low-power inverter, the common end of the 3rd power device and the 4th power device is another output of single-phase low-power inverter, be connected with the first electric capacity be connected in series mutually and the second electric capacity between two inductance, the first electric capacity is connected with the negative terminal of direct current input source with the common end of the second electric capacity.The utility model solves the volume that leakage problem reduces again circuit board, reduces cost.
Description
Technical field
The utility model relates to field of photovoltaic power generation, is specifically related to a kind of single-phase low-power inverter.
Background technology
Early stage photovoltaic DC-to-AC converter has power frequency isolation transformer to realize the isolation of electrical network and inverter, but Industrial Frequency Transformer volume is large, and cost is high, influential system overall efficiency.Non-isolated photovoltaic DC-to-AC converter efficiency is higher; but non-isolated photovoltaic DC-to-AC converter is isolated owing to not having transformer and electrical network; parasitic capacitance is there is between photovoltaic battery panel and the earth; a common mode loop is formed between parasitic capacitance and photovoltaic battery panel, inverter, electrical network when inverter works; the change of common-mode voltage can cause the change of capacitor charge and discharge; thus define leakage current; leakage current can cause electrical network to distort, impact human-body safety, so photovoltaic DC-to-AC converter should reduce the generation of leakage current.Current most of photovoltaic DC-to-AC converter is in order to solve leakage problem, and the topological structure of employing is H6 framework, as shown in Figure 1.This topological structure can suppress leakage current in theory, but the device that this topological structure uses is many, and cause wiring board volume comparatively large, cost is higher.
Summary of the invention
The purpose of this utility model is to provide simple, the lower-cost single-phase low-power inverter that can solve leakage problem of a kind of structure.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of single-phase low-power inverter being applied to photovoltaic generating system, comprise direct current input source, the topological structure be connected with described direct current input source, described topological structure forms two outputs of described single-phase low-power inverter, two outputs of described single-phase low-power inverter are through two inductance access electrical networks, described topological structure is the H4 framework of employing four power devices, four described power devices are respectively the first power device, second power device, 3rd power device and the 4th power device, the first described power device and the second described power device are connected in series mutually and are connected between the positive and negative terminal of described direct current input source, the 3rd described power device and the 4th described power device are connected in series mutually and are connected between the positive and negative terminal of described direct current input source, the common end of the first described power device and the second described power device is an output of described single-phase low-power inverter, the common end of the 3rd described power device and the 4th described power device is another output of described single-phase low-power inverter, be connected with the first electric capacity and the second electric capacity that are connected in series mutually between inductance described in two, the first described electric capacity is connected with the negative terminal of described direct current input source with the common end of the second described electric capacity.
Described power device comprises triode and is connected to the diode between the collector and emitter of described triode.
The 3rd electric capacity is also connected with between inductance described in two.
Because technique scheme is used, the utility model compared with prior art has following advantages: the utility model adopts H4 framework to add the mode of electric capacity, has not only solved leakage problem but also has reduced the volume of circuit board, reduced cost.
Accompanying drawing explanation
Accompanying drawing 1 is the schematic diagram of existing inverter.
Accompanying drawing 2 is the schematic diagram of single-phase low-power inverter of the present utility model.
Embodiment
Below in conjunction with embodiment shown in the drawings, the utility model is further described.
Embodiment one: as shown in Figure 2, a kind of single-phase low-power inverter being applied to photovoltaic generating system, the topological structure comprise direct current input source DC, being connected with direct current input source DC.Topological structure forms two outputs of single-phase low-power inverter, concrete, this topological structure is the H4 framework of employing four power devices, four power devices are respectively the first power device Q1, the second power device Q2, the 3rd power device Q3 and the 4th power device Q4, and each power device includes triode and is connected to the diode between the collector and emitter of triode.First power device Q1 and the second power device Q2 phase are connected in series and are connected between the positive and negative terminal of direct current input source DC, 3rd power device Q3 and the 4th power device Q4 phase are connected in series and are connected between the positive and negative terminal of direct current input source DC, the common end of the first power device Q1 and the second power device is an output of single-phase low-power inverter, and the common end of the 3rd power device Q3 and the 4th power device is another output of single-phase low-power inverter.Two outputs that the topological structure of single-phase low-power inverter is formed access electrical network AC through two inductance L 1, L2, be connected with the first electric capacity C1 and the second electric capacity C2 that are connected in series mutually between two inductance L 1, L2, the first electric capacity C1 is connected with the negative terminal of direct current input source DC with the common end of the second electric capacity C2.The 3rd electric capacity C3 is also connected with between two inductance L 1, L2.
During the work of this inverter, the first electric capacity C1 and the second electric capacity C2 provides low-impedance common mode loop for common mode current, inhibits the output of common mode disturbance voltage, utilizes this circuit both can reduce differential mode EMI electric current, also can suppress leakage current.
The utility model adopts H4 framework to add the mode of electric capacity, and main circuit part, just with 4 power devices, contrasts H6 framework and eliminates 4 power devices, has not only solved leakage problem but also has reduced the volume of circuit board, reduced cost.The utility model adopts capacitances in series in filter inductance rear end, and electric capacity mid point receives cell panel negative pole, can suppress the generation of leaking electricity like this, decrease number of elements simultaneously.The program solves the electrical leakage problems because the parasitic capacitance of cell panel to the earth causes, and decreases the volume of number of elements and circuit board, reduces system cost.
Because technique scheme is used, the utility model compared with prior art has following advantages: the utility model adopts H4 framework to add the mode of electric capacity, has not only solved leakage problem but also has reduced the volume of circuit board, reduced cost.
Above-described embodiment, only for technical conceive of the present utility model and feature are described, its object is to person skilled in the art can be understood content of the present utility model and implement according to this, can not limit protection range of the present utility model with this.All equivalences done according to the utility model Spirit Essence change or modify, and all should be encompassed within protection range of the present utility model.
Claims (3)
1. one kind is applied to the single-phase low-power inverter of photovoltaic generating system, comprise direct current input source, the topological structure be connected with described direct current input source, described topological structure forms two outputs of described single-phase low-power inverter, two outputs of described single-phase low-power inverter are through two inductance access electrical networks, it is characterized in that: described topological structure is the H4 framework of employing four power devices, four described power devices are respectively the first power device, second power device, 3rd power device and the 4th power device, the first described power device and the second described power device are connected in series mutually and are connected between the positive and negative terminal of described direct current input source, the 3rd described power device and the 4th described power device are connected in series mutually and are connected between the positive and negative terminal of described direct current input source, the common end of the first described power device and the second described power device is an output of described single-phase low-power inverter, the common end of the 3rd described power device and the 4th described power device is another output of described single-phase low-power inverter, be connected with the first electric capacity and the second electric capacity that are connected in series mutually between inductance described in two, the first described electric capacity is connected with the negative terminal of described direct current input source with the common end of the second described electric capacity.
2. the single-phase low-power inverter being applied to photovoltaic generating system according to claim 1, is characterized in that: described power device comprises triode and is connected to the diode between the collector and emitter of described triode.
3. the single-phase low-power inverter being applied to photovoltaic generating system according to claim 1, is characterized in that: be also connected with the 3rd electric capacity between the inductance described in two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520301301.8U CN204615690U (en) | 2015-05-12 | 2015-05-12 | Be applied to the single-phase low-power inverter of photovoltaic generating system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520301301.8U CN204615690U (en) | 2015-05-12 | 2015-05-12 | Be applied to the single-phase low-power inverter of photovoltaic generating system |
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| CN204615690U true CN204615690U (en) | 2015-09-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868772A (en) * | 2015-05-12 | 2015-08-26 | 江苏固德威电源科技有限公司 | Single-phase low-power inverter applied to photovoltaic power generation system |
| WO2020211424A1 (en) * | 2019-04-17 | 2020-10-22 | 华为技术有限公司 | Power conversion circuit, inverter, and control method |
-
2015
- 2015-05-12 CN CN201520301301.8U patent/CN204615690U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868772A (en) * | 2015-05-12 | 2015-08-26 | 江苏固德威电源科技有限公司 | Single-phase low-power inverter applied to photovoltaic power generation system |
| WO2020211424A1 (en) * | 2019-04-17 | 2020-10-22 | 华为技术有限公司 | Power conversion circuit, inverter, and control method |
| US11984819B2 (en) | 2019-04-17 | 2024-05-14 | Huawei Digital Power Technologies Co., Ltd. | Power conversion circuit, inverter, and control method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 215163 Kunlun high tech Zone, Jiangsu Province, Suzhou City Road, No. 189 Patentee after: JIANGSU GOODWE POWER SUPPLY TECHNOLOGY CO., LTD. Address before: 215163 Kunlun high tech Zone, Jiangsu Province, Suzhou City Road, No. 189 Patentee before: Jiangsu Goodwe Power Supply Technology Co., Ltd. |
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| CP03 | Change of name, title or address |
Address after: 215000 No. 90, Zijin Road, high tech Zone, Suzhou, Jiangsu Patentee after: Goodway Technology Co.,Ltd. Address before: 215163 No. 189 Kunlun mountain road, hi tech Zone, Suzhou, Jiangsu Patentee before: JIANGSU GOODWE POWER SUPPLY TECHNOLOGY Co.,Ltd. |
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| CP03 | Change of name, title or address |