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Inverter circuit used for solar energy photovoltaic grid connection and device thereof

A solar photovoltaic and inverter circuit technology, applied in photovoltaic power generation, conversion of irreversible DC power input to AC power output, single-net parallel feeding arrangement, etc., can solve the problem of increased product weight, increased material cost, and reduced conversion efficiency etc. to achieve low cost, light weight and high conversion efficiency

Active Publication Date: 2010-03-10
SHENZHEN EN PLUS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the addition of an isolation transformer can improve the above leakage current and EMI problems, however, due to the addition of an isolation transformer, it also causes a decrease in conversion efficiency, an increase in product weight, and an increase in material costs

Method used

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  • Inverter circuit used for solar energy photovoltaic grid connection and device thereof
  • Inverter circuit used for solar energy photovoltaic grid connection and device thereof
  • Inverter circuit used for solar energy photovoltaic grid connection and device thereof

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Embodiment Construction

[0028] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0029] figure 1 A schematic diagram showing the structure of a full-bridge inverter circuit used for grid-connected photovoltaics in the prior art, since its specific structure has been roughly described in the background art, it will not be repeated here. It should be noted that in figure 1 In , the connection of the gates (control electrodes) of MOSFET Q1, MOSFET Q2, MOSFET Q3, and MOSFET Q4 and the control circuit connected to the gates are not shown. Since it is the prior art, the above omissions will not cause difficulties and mistakes in understanding to those skilled in the art. In the prior art, the control signals of MOSFET Q1 and MOSFET Q4 of the full-bridge inverter circuit are the same, and MOSFET Q1 and MOSFET Q4 only work in the positive half cycle of the alternating current of the grid, and do not work in the negative half cycle; similar...

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Abstract

The invention relates to an inverter circuit used for solar energy photovoltaic grid connection, comprising first, second, third and fourth controlled switches used for converting direct current (DC)of solar cells to alternating current (AC) suitable for grid connection. The four controlled switches are connected in a full-bridge manner. The connection point of the first controlled switch and thesecond controlled switch is a first AC output point. The connection point of the third controlled switch and the fourth controlled switch is a second AC output point. The inverter circuit also comprises a first afterflow module which is connected between the first AC output point and the second AC output point when on the positive semi-cycle of the AC output voltage, and a second afterflow modulewhich is connected between the first AC output point and the second AC output point when on the negative semi-cycle of the AC output voltage. The inverter circuit and a device thereof have the effects of low cost, light weight and high conversion efficiency.

Description

technical field [0001] The invention relates to an inverter circuit and its device, more specifically, to an inverter circuit and its device for solar photovoltaic grid connection. Background technique [0002] Solar energy is a kind of clean and renewable energy. With the shortage of energy, solar energy is receiving great attention. Recently, with the advancement of technology, the use of solar energy for photovoltaic power generation has become more and more widespread. Therefore, its grid-connected inverter technology has been widely concerned; at present, the photovoltaic grid-connected inverter mainly uses a full-bridge inverter circuit, but this circuit has a large common-mode voltage at the DC end of the solar cell; and because the solar panel (or PV panel) has a large area, and there is a large parasitic capacitance between the PV panel and the ground. Therefore, when this type of inverter is used, it often generates a large common-mode leakage current to the groun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/42H02M7/48H02J3/38
CPCY02E10/563Y02E10/56
Inventor 赵磊
Owner SHENZHEN EN PLUS TECH CO LTD
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