Buck/Boost converter for photovoltaic system

A boost converter, photovoltaic system technology, applied in photovoltaic power generation, control/regulation systems, conversion of DC power input to DC power output, etc., can solve the problem of high cost of voltage converters, low output power quality, complex control, etc. problems, to achieve the effect of simple control, low cost and improved quality

Inactive Publication Date: 2015-05-20
TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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Problems solved by technology

[0003] In order to improve the characteristics of high cost, complicated control and low output power quality of the voltage converter in the existing photovoltaic system, the present invention proposes a photovoltaic system voltage converter, which can convert light energy into electrical energy through a photovoltaic array, Buck Type DC / DC circuit and Boost type DC / DC circuit transform the output voltage of the photovoltaic array into a DC voltage with continuous input and output current and adjustable output voltage range, and the output voltage can be greater than or less than the input voltage, and can also be adjusted by adjusting the switching tube Working status, correcting the power factor of the power system

Method used

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  • Buck/Boost converter for photovoltaic system

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Embodiment Construction

[0008] exist figure 1 Among them, the photovoltaic array converts light energy into electrical energy under illumination, and the Buck type DC / DC circuit makes the output voltage of the voltage converter adjustable, and the continuity of the output current increases. The subsequent Boost type DC / DC circuit will The voltage output by the photovoltaic array is boosted and isolated to expand the output voltage range. By controlling the switching tube of the Boost converter, the power factor can be improved. In the subsequent stage, the switching tube in the converter adopts a frequency adjustable duty cycle. The pulse trigger control of the Buck and Boost converters, the inductors in the Buck and Boost converters play the role of energy storage and filtering in the converters, and the parallel capacitors make the output voltage more stable and smooth, so that the photovoltaic system can output DC voltage with a wide range of adjustable voltage and continuous output current .

[...

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Abstract

A Buck / Boost converter for a photovoltaic system is characterized in that DC voltage output by a photovoltaic array of a photovoltaic system can be converted into adjustable DC power, having continual input / output current and large output voltage range, through a Buck and Boost type DC / DC chopper circuit, output voltage is selectively greater than or less than input voltage, and a power factor of the converter is corrected by adjusting running state of a switch tube.

Description

Technical field [0001] The patent of the present invention is a buck-boost converter for a photovoltaic system, which is applied to a photovoltaic power generation system. Background technique [0002] Due to its renewable, clean and inexhaustible characteristics, solar photovoltaic power generation is developing into an important part of the world's energy composition. Household off-grid photovoltaic power generation systems mainly provide lighting, refrigeration and other simple household appliances that do not have strict requirements on power quality for users far from the large power grid to ensure their daily needs. In areas where the land is sparsely populated and the large power grid is not connected, the quality of people's daily life is reduced due to lack of electric energy. The inverter circuit of the off-grid photovoltaic power generation system can provide electric energy for areas with insufficient electric energy and sufficient sunlight. The existing voltage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156
CPCH02M3/156H02M3/1566Y02E10/56
Inventor 庞党锋王创荣
Owner TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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