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High-efficiency photovoltaic grid connected inverter

An inverter, high-efficiency technology, applied in photovoltaic power generation, conversion of DC power input to DC power output, and conversion of AC power input to DC power output, etc., can solve the problems of low efficiency, high cost, and narrow load range, etc. Achieve high efficiency, low cost and wide load range

Inactive Publication Date: 2015-07-15
SHAANXI UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to solve the defects of narrow load range, high cost and low efficiency of existing photovoltaic grid-connected inverters in the above-mentioned prior art, and propose a high-efficiency photovoltaic grid-connected inverter

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Embodiment Construction

[0016] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0017] See figure 1 , The present invention includes: DSP controller, first MOS transistor Q1, second MOS transistor Q2, transformer TT, drive circuit, sampling circuit, inductor, capacitor, load, transformer T includes a primary winding and two secondary windings.

[0018] The drain of the first MOS transistor Q1 is connected to the positive input terminal, the source of the first MOS transistor Q1 is connected to the drain of the second MOS transistor Q2, and the source of the second MOS transistor Q2 is grounded; the two PWM outputs of the DSP controller are driven by The circuits are respectively connected to the gates of the first MOS transistor Q1 and the second MOS transistor Q2. The first analog / digital terminal of the DSP controller is connected to the positive input terminal through the first voltage sampling circuit, and the second...

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Abstract

The invention discloses a high-efficiency photovoltaic grid connected inverter, and belongs to the technical field of power electronic converters. The high-efficiency photovoltaic grid connected inverter comprises a DSP controller, a first MOS pipe, a second MOS pipe, a transformer, a driving circuit, sampling circuits, an inductor, capacitors and a load, wherein the transformer comprises a primary winding and two secondary windings. In the field of photovoltaic power generation, a DC-DC conversion part is a key part of the inverter; at present, a DC-DC conversion part adopts a hard switching technology generally, so that the electric energy conversion efficiency is too low, and meanwhile, since voltage stress and current stress in a circuit are too high, relatively strong electromagnetic interference is caused. Therefore, an LLC resonant conversion technology is adopted, self parasitic parameters of components are fully used, the voltage stress and the current stress are reduced, a switching frequency can be equal to a resonant frequency, and the conversion efficiency is improved. The high-efficiency photovoltaic grid connected inverter is especially suitable for being used on occasions where requirements on the efficiency of the inverter are relatively high.

Description

Technical field [0001] The invention belongs to the technical field of power electronic converters, and particularly relates to a high-efficiency photovoltaic grid-connected inverter. Background technique [0002] With the consumption of oil, coal and other resources, energy shortages have become more and more serious, and the pollution caused by them has become more and more serious, which has a greater impact on people’s lives and health. Therefore, the development of new energy and clean energy It is the general trend. In recent years, solar power generation has been widely used and achieved certain benefits. As the core component of the photovoltaic inverter system of the photovoltaic grid-connected inverter, the traditional method uses a power frequency isolation transformer T, which makes the inverter bulky, heavy, high-cost, and low-efficiency. [0003] At the same time, most of the existing photovoltaic grid-connected inverters use analog components and analog control met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/537H02M3/335
CPCY02E10/56
Inventor 史永胜李利高丹阳王喜峰宁青菊
Owner SHAANXI UNIV OF SCI & TECH
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