A photovoltaic battery power supply device and method

Abstract

The invention relates to a variable voltage source, a photovoltaic cell power supply device and a method thereof. The variable voltage source includes a contact selection device, a metal contact group and a battery row; the metal contact group is electrically connected to the battery row, and the metal contact group includes A plurality of metal contacts, the battery row is composed of a plurality of batteries in series; the voltage from the first metal contact to the last metal contact increases sequentially; the contact selection device includes a contact, one end of the contact is selectively connected to the metal contact The metal contacts with different contact connections output different voltages. Under the control of the maximum power tracking controller, the variable voltage source adjusts the terminal voltage of the variable voltage source to the voltage corresponding to the maximum power point of the photovoltaic cell array, and supplies power to the load according to the voltage value corresponding to the maximum power point of the photovoltaic cell, ensuring The maximum power output of the photovoltaic cell array improves the energy recovery rate of the photovoltaic cell; the variable voltage source can also store the electric energy generated by the photovoltaic cell array to realize continuous power generation of the photovoltaic cell.

Description

technical field [0001] The invention relates to the field of photovoltaic battery power supply, in particular to a variable voltage source, photovoltaic battery power supply device and method. Background technique [0002] At present, the application scope of photovoltaic power generation is getting wider and wider, but the technical bottleneck limitation of low power generation efficiency restricts its popularization. [0003] Photovoltaic battery is an intermittent and fluctuating power generation without self-storage capability. The power generation is greatly affected by the environment, and there are different maximum power points at different times. It is necessary to output a specific voltage and current in order to give full play to the power generation capacity of photovoltaic cells and achieve maximum power output. If the output voltage does not match, the maximum power output cannot be achieved, and the power generation capacity of the photovoltaic cell cannot be...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a variable voltage source, photovoltaic cell power supply device and method, which can overcome the problems of photovoltaic cell power generation energy loss and unsustainable power generation caused by PWM control of photovoltaic cell output on and off, and at the same time ensure photovoltaic The battery always runs at the maximum power point to achieve the maximum power output of the photovoltaic cell, and supplies power to the load according to the voltage value corresponding to the maximum power point to improve the energy recovery rate of the photovoltaic cell

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