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Apparatus and method for improving output efficiency of low-power photovoltaic battery

A photovoltaic cell and output efficiency technology, applied in battery circuit devices, photovoltaic power generation, circuit devices, etc., can solve problems such as the optimal voltage control method that does not involve the output efficiency of photovoltaic cells

Inactive Publication Date: 2009-05-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of the above-mentioned patents and documents involves the optimal voltage control method for improving the output efficiency of photovoltaic cells.

Method used

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  • Apparatus and method for improving output efficiency of low-power photovoltaic battery

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Embodiment

[0042] Suppose a photovoltaic cell with an area of ​​150mm×67mm is in the average solar irradiance E=93mW / cm 2 under conditions such as Figure 5 As shown in c. In an optimal voltage control cycle, the photovoltaic cell output energy is stored in 2 120F supercapacitors in series.

[0043] Such as Figure 5 As shown in a, when the voltage of the supercapacitor rises from 4.3V to 5.3V, the output power of the photovoltaic cell W 1 as follows:

[0044] W 1 = 1 2 C ( V 2 2 - V 1 2 ) = 30 × ( 5.3 2 - 4.3 2 )

[0045] ...

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Abstract

The invention discloses a device for improving output efficiency of a miniwatt photovoltaic cell and a method thereof, belonging to the electrooptical technical field. In the invention, based on the optimum voltage control method, by arranging a supercapacitor and an optimum voltage controller between the photovoltaic cell and an energy accumulator and taking advantage of the characteristic of low essential resistance of the supercapacitor, the terminal voltage Vc of the supercapacitor directly affects the output voltage Vs of the photovoltaic cell; and by controlling the charge-discharge process of the supercapacitor to control the output voltage of the photovoltaic cell, the photovoltaic cell can work in a maximum power output area, thus effectively improving the output efficiency of the photovoltaic cell. Compared with the traditional method, the invention has the advantages of simple circuit and low self power consumption, and is suitable for being used in a miniwatt micro photovoltaic system.

Description

technical field [0001] The invention relates to a device and a method for improving the output efficiency of a low-power photovoltaic cell, belonging to the field of photoelectric technology. Background technique [0002] The manufacturing technology of photovoltaic cells and photovoltaic power generation technology are quite mature. However, the use of photovoltaic micro-energy to power the system in photovoltaic energy autonomous micro-systems has only been researched and applied in recent years. In photovoltaic energy autonomous microsystems, the area of ​​photovoltaic cells is usually less than tens of square centimeters, the output voltage is low (generally several volts), and the power is less than 1 watt. Therefore, there is a need to improve the photovoltaic cell output efficiency of microsystems. [0003] Traditional methods used to improve the output efficiency of photovoltaic cells, such as maximum power point tracking (MPPT) technology, include "hill climbing" ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H02J15/00G05F1/67
CPCY02E70/30Y02E10/58Y02E10/56
Inventor 李艳秋何永泰刘丽辉王磊
Owner BEIJING INSTITUTE OF TECHNOLOGYGY