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High Efficiency Three Level Single Phase Inverter

A technology of inverter and voltage, which is applied in the direction of converting AC power input to DC power output, wind power generation, photovoltaic power generation, etc., and can solve problems such as heavy weight, no improvement in power conversion efficiency, and inconsistent power factor

Active Publication Date: 2015-09-09
KOHLER CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these transformers have serious disadvantages such as heavy weight, high cost, low efficiency, non-uniform power factor (especially at low loads)
High frequency inverters with transformers reduce weight and have consistent power factor, but do not improve the efficiency of power conversion

Method used

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  • High Efficiency Three Level Single Phase Inverter
  • High Efficiency Three Level Single Phase Inverter
  • High Efficiency Three Level Single Phase Inverter

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Experimental program
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Embodiment Construction

[0014] Before describing in detail any embodiments of the invention, it is to be understood that the invention is not limited in application to the details of construction and arrangement of the components set forth in the following description and illustrated in the following drawings. The invention also includes other embodiments that can be practiced or carried out in various ways.

[0015] figure 1 A power conversion system 100 is shown. The power conversion system 100 includes a photovoltaic (PV) panel 105 , a DC / DC converter 110 , an inverter 115 and an AC grid 120 . The PV panels 105 receive solar radiation and convert the radiation into DC electricity. The PV panel outputs DC power to a DC / DC converter 110 . The DC / DC converter 110 accumulates or amplifies the DC power to a level suitable for the inverter 115 . For example, the DC / DC converter 110 provides a DC output having predetermined characteristics, such as a specific voltage within a predetermined allowable ...

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Abstract

A highly efficient transformerless inverter and a method of controlling the same. The inverter is designed for use in a distributed power generation system, such as a home having photovoltaic cells (e.g., a solar panel), wind turbines, batteries, and other sources of DC electrical power. The inverter includes four switching states including a positive current path for a positive half-cycle, a free-wheel current path for the positive half-cycle, a negative current path for a negative half-cycle, and a second free-wheel current path for the negative half-cycle. The free-wheel current paths include a reduced number of circuit components (e.g., diodes), which enables a highly efficient inversion of DC power to AC power.

Description

technical field [0001] The invention relates to electrical inverters. More specifically, it relates to a three-level single-phase inverter. The inverter can be applied to a grid-connected system. Background technique [0002] An inverter is a device that converts direct current (DC) into alternating current (AC). One type of inverter can be constructed by connecting a DC source to the center tap of the main winding of a transformer. A switch connected to a DC source switches quickly between two nodes (each connected to opposite ends of the main winding) so that current flows back to DC through two alternate paths (through one end of the main winding and then through the other) source. The alternation of the current direction in the primary winding of the transformer produces alternating current (AC) electricity in the secondary winding, which inverters of this design or other designs can receive from sources such as solar panels, generators, wind turbines, batteries, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02M7/483
CPCH02M7/487Y02B10/14Y02E10/56Y02E10/76Y02B10/30Y02B10/10
Inventor 王子涛(彼得)
Owner KOHLER CO