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Single-phase online inverter with switchable topology

A switching type and inverter technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problems affecting the inverter working efficiency, power device loss, inverter structure, etc. Complicated problems, to achieve the effect of improved work efficiency, small size, and simple system structure

Inactive Publication Date: 2014-01-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention proposes a single-phase online topology switchable inverter in order to solve the problem that the structure of the existing fixed topology inverter is complex and the loss of power devices is serious, which further affects the working efficiency of the inverter.

Method used

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  • Single-phase online inverter with switchable topology
  • Single-phase online inverter with switchable topology
  • Single-phase online inverter with switchable topology

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specific Embodiment approach 1

[0030] Specific implementation mode 1. Combination figure 1 Describe this specific implementation mode, single-phase online topology switchable inverter, which includes No. 1 DC power supply U dc1 , No. 2 DC power supply U dc2 , No.1 power switch S 11 , No. 1 diode D 11 , No. 2 power switch S 12 , No. 2 diode D 12 , No. 3 power switch S 13 , No. 3 diode D 13 , No.4 power switch S 14 , No. 4 diode D 14 , No. 5 power switch S 21 , No. 5 diode D21 , No. 6 power switch S 22 , No. 6 diode D 22 , No. 7 power switch S 23 , No. 7 diode D 23 , No. 8 power switch S 24 , No. 8 diode D 24 and bidirectional switch S 3 ,

[0031] No. 1 DC power supply U dc1 The positive pole of the power switch S is connected with the first power switch S 11 The power input terminal, the first diode D 11 The cathode of the No. 3 power switch S 13 The power input terminal and the third diode D 13 the cathode connection,

[0032] No. 1 DC power supply U dc1 The negative pole of the powe...

specific Embodiment approach 2

[0042] Embodiment 2. The difference between this embodiment and the single-phase online topology switchable inverter described in Embodiment 1 is that the No. 1 DC power supply U dc1 and No. 2 DC power supply U dc2 The output voltage levels are the same.

specific Embodiment approach 3

[0043] Embodiment 3. The difference between this embodiment and the single-phase online topology switchable inverter described in Embodiment 2 is that the No. 1 DC power supply U dc1 and No. 2 DC power supply U dc2 The output power level is the same.

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Abstract

The invention discloses a single-phase online inverter with a switchable topology, relates to the technical field of conversion of electrical energy, and solves the problem that the working efficiency of inverters is influenced due to the fact that the structure of a conventional inverter with a fixed topology is complicated and loss of a power device is serious. According the inverter, a first power switch S11, a first diode D11, a third power switch S13, a third diode D13, a fourth power switch S14, a fourth diode D14, a second power switch S12 and a second diode D12 constitute an H bridge; a fifth power switch S21, a fifth diode D21, a seventh power switch S23, a seventh diode D23, an eighth power switch S24, an eighth diode D24, a sixth power switch S22 and a sixth power switch D22 constitute the other H bridge; and a power output end of the fourth power switch S14 is connected with a power input end of a bilateral switch S3, a power output end of the eighth power switch S24 is connected with a power output end of the bilateral switch S3, a power output end of the third power switch S13 is connected with a power output end of the fifth power switch S21, and a first direct-current power supply Udc1 and a second direct-current power supply Udc2 are connected to outer sides of the two H bridges respectively. The single-phase online inverter is applicable to conversion of electrical energy.

Description

technical field [0001] The invention relates to the technical field of electric energy conversion. Background technique [0002] Issues such as energy shortage and deteriorating environment in today's world have been widely concerned. The photovoltaic power generation technology with clean and zero-pollution characteristics provides a new development direction for solving energy problems. Since the photovoltaic power generation source is affected by the intensity of sunlight, its output voltage presents a characteristic of large fluctuations, and it is difficult to directly apply it to grid-connected power generation or constant voltage AC power supply. In order to solve the above problems, DC-DC-AC-based two-stage conversion structure, single-stage Z-source inverter structure and multi-level power conversion structure are all applied in photovoltaic power generation systems. The two-stage structure of DC-DC-AC is mainly composed of photovoltaic cells, DC-DC converters, an...

Claims

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Application Information

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IPC IPC(8): H02M7/483
Inventor 骆素华吴凤江骆林松冯帆张陆捷
Owner HARBIN INST OF TECH
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