Solar-cell panel maximum power tracking device, tracking method and solar power supply device using same

Abstract

The present invention relates to a maximum power point tracking circuit for a solar panel. In one embodiment, the circuit can include: a real-time power calculator that receives a real-time output voltage and a real-time output current of the solar panel, and generates a real-time power of the solar panel; a memory power generator coupled to the real-time power calculator, and that generates a memory power based on the real-time power; a comparing circuit that compares the real-time power against the memory power, where an output of the comparing circuit is configured to control a controlling signal for a solar power supply apparatus; and a reset circuit that receives the real-time output voltage of the solar panel, where an output of the reset circuit is configured to control the controlling signal.

Description

technical field [0001] The invention relates to a solar power supply system, in particular to a maximum power tracking device and a maximum power tracking method for a solar panel, as well as a solar power supply device and a solar panel array power supply system using the same. Background technique [0002] As a new way of electric energy production, solar discharge shows a broad space for development due to its characteristics of no pollution, no noise and simple maintenance. However, in practical applications, due to the nonlinear characteristics of solar panel characteristics, and its output is affected by light intensity, ambient temperature and load, etc., such as Figure 1A and Figure 1B As shown, under a certain light intensity and ambient temperature, the solar cell can work at different output voltages, but only at a certain output voltage value, the output power of the solar cell reaches the maximum value. At this time, the operating point of the solar cell It r...

AI Technical Summary

Problems solved by technology

The digital control structure is relatively complex, the circuit occupies a large area, and the cost is high, which is not conducive to the application of smaller portable devices; and, for large-scale solar panel arrays, a large number of data acquisition systems are required, which is not convenient for upgrading the solar power supply system , management, and at the same time, the redundancy of the system is relatively poor

[0006] Most of the existing solar panel maximum power tracking control chips implemented by analog control methods are based on the open circuit voltage detection method, which is difficult to obtain a high tracking accuracy of the maximum output power point of the solar panel, and is also relatively affected by environmental factors such as light and temperature. Large, difficult to be widely used and promoted

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